Re: [Emc-users] [Off] Ballscrew Support?

[Jeshua Lacock]

Greetings,

So I just got a response from my ballscrew vendor. They can supply a 40mm 
diameter with 40mm pitch (3048 mm long) for a reasonable cost. Less than $1k 
including shipping and machining.

Looks like that could safely rotate at 977 RPM which would move the ballnut at 
1538 IPM (with both ends supported with double bearings spaced apart).

Even though it will cost me additional money, it may cost less (not to mention 
significant time/experimentation/etc) compared to machining the required 
hardware to drive the ballnut with my current ballscrews. Also, seems like 
rotating the ballscrew can be problematic - I read at sufficient RPM's the 
lubrication can driven away from the ballscew from centrifugal force.

I was planning on having a ballscrew for each rail, but if I go this route I 
think I will only have a single ballscrew in the middle of both rails. The main 
reason (besides cost) is the significant inertia the ballscrew will have 
rotating at speed.


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] [Off] Ballscrew Support?

[Mark Wendt]

On Sun, Jul 22, 2012 at 6:25 PM, Jeshua Lacock  wrote:

> >
> > Dunno why they said that, I've been running the rack and pinion for a few
> > years now, as have quite a few others on their machines, and the rack and
> > pinion works just fine.  No resonance, though that's usually a factor of
> > the stepper motor and drive, and there are ways to dampen the resonance
> so
> > that it's a non-factor.
> >
> > I like the very minimal amount of backlash, and very positive gear
> > engagement in my setup.
>
> Thanks Mark, good to know!
>
>
> Cheers,
>
> Jeshua Lacock
>

Jeshua,

Yeah, don't know why they said that, unless they had a poorly designed rack
and pinion system.  I got mine from CNC Router parts and Boston Gear for
the rack.  Not terribly expensive either, and Boston Gear doesn't mind
working with the little guys like us.  I'll have to dig up my contact point
at Boston Gear.  She was very knowledgeable and very good at  taking care
of customer service.  I think I have her name and email address at home
somewhere.  Can't seem to find it here at work.

Mark
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Re: [Emc-users] rapid prototype

[Eric H. Johnson]

Aram,

See:
http://reprap.org/wiki/EMCRepRap
http://reprap.org/wiki/Main_Page

Regards,
Eric



interesting if anyone used EMC to build rapid prototype machine.
it should be 4 axis machine. 3 axis X Y Z and 4th axis head that injects
liquid wax -plastic.
Problem is in how from 3d surface/solid model generate G M code program to
move axis and govern the head?
idea is covert 3 axis mill into rapid prototype machine.
i think there is demand in industry for such low cost conversion.




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[Emc-users] Wax? [Was: rapid prototype]

[Erik Christiansen]

On 23.07.12 07:20, Eric H. Johnson wrote:
> interesting if anyone used EMC to build rapid prototype machine.
> it should be 4 axis machine. 3 axis X Y Z and 4th axis head that injects
> liquid wax -plastic.

Now that is very thought provoking. Is anyone making wax patterns with
one of these CNC extruders? Being able to CNC a pattern for lost wax
casting would be just the thing when hot-wire cutting of polystyrene
foam has trouble with the shape, e.g. due to fiddliness.

Maybe it's practical, if the print head did not fully melt the wax, but
higher temperatures could still do so, to void the mould?

Erik

-- 
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a good idea. It is hard to be sure where they are going to land, and it could 
be dangerous sitting under them as they fly overhead."-- RFC 1925 
   (1 April 1996)

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Re: [Emc-users] Wax? [Was: rapid prototype]

[Mark Wendt]

On Mon, Jul 23, 2012 at 8:45 AM, Erik Christiansen
wrote:

> On 23.07.12 07:20, Eric H. Johnson wrote:
> Erik
>
> --
> "With sufficient thrust, pigs fly just fine. However, this is not
> necessarily
> a good idea. It is hard to be sure where they are going to land, and it
> could
> be dangerous sitting under them as they fly overhead."-- RFC
> 1925
>(1 April
> 1996)
>

Eric,

Saw your sig box and just had to chuckle.  We said that about the F-4
Phantom I used to fly for the USAF.  Never had a problem landing it
though.  Well, except for that one time when the hydraulics...  ;-)

Mark
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[Emc-users] The screw works!

[Gene Heskett]

To Andy & Steve;

I made another of the dual thread screws yesterday, and can report that it 
seems to work well.  However it seems that I must have a flexibility 
problem in using a cutoff knife sharpened with a 60 degree V and a slight 
(10 degree?) hook though.  Or it doesn't have sufficient 'heel' clearance 
and is being pushed until there is a supporting thread on both sides of the 
tooth.

The entrance thread, even though the starting point of the fwd cutting 
stroke is well off the end of the workpiece, I am getting a 'first thread 
is bigger' effect, about 15 thou bigger TBE!  This was very obvious when I 
cut the 10-32 thread, slightly less so when I cut the 7mmx1.00, but 
required I trim about 2/3rds of the first thread off with a dremel diamond 
wheel.

Two things became obvious, one being that I have no way to actually measure 
the pitch diameter of a thread in progress, and because of the fat end 
thread syndrome, it doesn't seem practical to try and use the matching 
threading die as an "am I done" test gage.  That, and the die I have seems 
to have several thou of thread clearance, so a hole tapped with the tap, is 
a pretty sloppy fit on a screw made by the matching die.  I like my threads 
to fit better than that.

How much of a heel clearance angle do you folks use when sharpening a 
single tooth, and how much 'hook' on the top face?

I want to make a jig for this as setting up the rotary table on the mill, 
and tipping it fwd to get the heel clearance angle seems to work but is a 
setup PIMA due to the tables motor hitting the heads gearbox.

Cheers, Gene
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Re: [Emc-users] [Off] Ballscrew Support?

[Todd Zuercher]

It may depend a lot on how well the machine is designed around the rack.
We have two moving gantry 5x10ft routers that have been no end of a
maintenance nightmare for me, because of their rack and pinion design.
Since 2005 I have had to replace 2 sets of racks 4 sets of pinions, and
countless bearings, and transmission shafts in the drive train for the
rack and pinion on each machine.  And the quality of the cut at
federates above 200ipm leaves much to be desired compared to our
similarly sized and specked ball screw driven machines.  To give them
credit we are using them much harder than they were designed for, we
run'em 24hr 5 days a week, and have more than twice as many machining
hours on them than any other machine the manufacturer knows of.

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street 
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031
 

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E-mail: to...@pgrahamdunn.com
630 Henry St.
Dalton, OH 44618
www.pgrahamdunn.com
-Original Message-
From: Mark Wendt [mailto:wendt.m...@gmail.com] 
Sent: Sunday, July 22, 2012 7:46 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] [Off] Ballscrew Support?

On Sat, Jul 21, 2012 at 8:38 PM, Jeshua Lacock 
wrote:




> > Of course, you could also just go the rack-and-pinion route.
> > The rack teeth should point down to shed dirt and chips.
>
> I don't recall the specifics, but I read somewhere that rack-and-pinon
was
> not a good solution. Maybe it had something to do with resonance?
>
>
> Cheers,
>
> Jeshua Lacock
>

Dunno why they said that, I've been running the rack and pinion for a
few
years now, as have quite a few others on their machines, and the rack
and
pinion works just fine.  No resonance, though that's usually a factor of
the stepper motor and drive, and there are ways to dampen the resonance
so
that it's a non-factor.

I like the very minimal amount of backlash, and very positive gear
engagement in my setup.

Mark



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Re: [Emc-users] [Off] Ballscrew Support?

[Viesturs Lācis]

2012/7/23 Todd Zuercher :
> And the quality of the cut at
> federates above 200ipm leaves much to be desired compared to our
> similarly sized and specked ball screw driven machines.  To give them
> credit we are using them much harder than they were designed for, we
> run'em 24hr 5 days a week, and have more than twice as many machining
> hours on them than any other machine the manufacturer knows of.

Well, the last sentence explains it all.
Machine is 7 years old, so it means - life of racks is about 2-3
years. IMHO that is not bad, especially, when You mention the
conditions of their use.

And I am sure, that You know - running ballscrews over their rated
load would lead to the same result. Just that ballscrews could have
higher rated load...

I have racks and pinions in waterjet machine, they work very nice. I
like them, because their maintenance is something I can do myself. I
would not like to start changing balls in ballscrew or something like
that...

-- 
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If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Wax? [Was: rapid prototype]

[Erik Christiansen]

On 23.07.12 08:51, Mark Wendt wrote:
> Saw your sig box and just had to chuckle.  We said that about the F-4
> Phantom I used to fly for the USAF.  Never had a problem landing it
> though.  Well, except for that one time when the hydraulics...  ;-)

With the single tailfin, I guess you'd be an inch shorter for a while,
if you'd had to eject.

Erik

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Re: [Emc-users] rapid prototype

[Florian Rist]

Hi Aram

> Problem is in how from 3d surface/solid model generate G M code program
> to move axis and govern the head?

That's no problem at all, Skineforge doese exactly that:

   http://fabmetheus.crsndoo.com/wiki/index.php/Skeinforge


See you
Flo

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Re: [Emc-users] Wax? [Was: rapid prototype]

[Mark Wendt]

On Mon, Jul 23, 2012 at 9:43 AM, Erik Christiansen
wrote:

> On 23.07.12 08:51, Mark Wendt wrote:
> > Saw your sig box and just had to chuckle.  We said that about the F-4
> > Phantom I used to fly for the USAF.  Never had a problem landing it
> > though.  Well, except for that one time when the hydraulics...  ;-)
>
> With the single tailfin, I guess you'd be an inch shorter for a while,
> if you'd had to eject.
>
> Erik
>

That's why Martin-Baker put rocket motors in the in the 0 - 0 seat.  ;-)

Mark
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Re: [Emc-users] [Off] Ballscrew Support?

[cogoman]

On 07/23/2012 03:05 AM, Jeshua Lacock wrote:
> So I just got a response from my ballscrew vendor. They can supply a 40mm 
> diameter with 40mm pitch (3048 mm long) for a reasonable cost. Less than $1k 
> including shipping and machining.
>
> Looks like that could safely rotate at 977 RPM which would move the ballnut 
> at 1538 IPM (with both ends supported with double bearings spaced apart).


   I have been impressed by the white paper for the PCNC1100, and since 
you're aiming for very high rapids, and since this white paper has some 
very good information, I recommend reading it, and all their white 
papers.  Some of the folks on this list could probably vouch for their 
veracity, I just didn't find any clear errors in their analysis.

http://www.tormach.com/engineering_pcnc1100.html

   I think I'd like to own one of these some day.

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[Emc-users] Docs/Messages

[Stuart Stevenson]

Gentlemen,
  I was thinking like a shop owner and it did not even hurt. :)

Is some of the resistance to LinuxCNC on machines the reality of lack of
service personnel? If this is so then maybe we should work on specific and
explicit docs and messages to allow the control to diagnose (or tell the
operator/repairman) the problem/s.

Since the hardware/software seems to be reliable an in house service man
doesn't touch the control side very often. This leads to unfamiliarity and
unease during the diagnostic phase.

The other CNC control manufacturers hide information. I think LinuxCNC
should appear different.

I am not suggesting the docs are not adequate. From what I have seen the
docs look good. I realize the application of message feedback is largely
the result of the integrator but the screen message capability is somewhat
less than clear and straightforward to me. I admit to not being deep in
LinuxCNC for a couple years. It looks as if I will have opportunity to get
back in it before long.

Maybe a debug gui with message tags at various places in the software to
display the control flow and where the current tag is stopped.

just dreaming while driving - :)

thanks
Stuart

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Re: [Emc-users] Docs/Messages

[cogoman]

On 07/23/2012 10:45 AM, Stuart Stevenson wrote:
> Maybe a debug gui with message tags at various places in the software to
> display the control flow and where the current tag is stopped.
   Are you thinking of a program to comb through the log files looking 
for error messages that we know how to fix?

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Re: [Emc-users] Docs/Messages

[Stuart Stevenson]

I was thinking of having a debug level of messages interspersed in the
config files that when read would build a display of the program flow with
a 'token' showing where the control flow is currently. This would allow a
debug to pinpoint the stopping point and also watch the flow during the
development phase.

this is just my idea of a possible solution to 'shop owner resistance'

On Mon, Jul 23, 2012 at 10:18 AM, cogoman  wrote:

> On 07/23/2012 10:45 AM, Stuart Stevenson wrote:
> > Maybe a debug gui with message tags at various places in the software to
> > display the control flow and where the current tag is stopped.
>Are you thinking of a program to comb through the log files looking
> for error messages that we know how to fix?
>
>
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Re: [Emc-users] Docs/Messages

[Belli Button]

I think 'Shop owner resistance' stems from the fact that LCNC does not have 
an 0800 'Help desk' or 'call your nearest agent', etc.  There is no '30 day 
money back satisfaction guarantee' or 'Full refund if you are not completely 
satisfied' which is a something that everybody expects these days, figuring 
stuff out by yourself or having to get your hands dirty is an instant 
obstacle for many.  No UI that gave you hints of faults or a debug list is 
going to change human nature.

Cheers,




- Original Message - 
From: "Stuart Stevenson" 
To: "Enhanced Machine Controller (EMC)" 
Sent: Monday, July 23, 2012 5:44 PM
Subject: Re: [Emc-users] Docs/Messages


>I was thinking of having a debug level of messages interspersed in the
> config files that when read would build a display of the program flow with
> a 'token' showing where the control flow is currently. This would allow a
> debug to pinpoint the stopping point and also watch the flow during the
> development phase.
>
> this is just my idea of a possible solution to 'shop owner resistance'
>
> On Mon, Jul 23, 2012 at 10:18 AM, cogoman  wrote:
>
>> On 07/23/2012 10:45 AM, Stuart Stevenson wrote:
>> > Maybe a debug gui with message tags at various places in the software 
>> > to
>> > display the control flow and where the current tag is stopped.
>>Are you thinking of a program to comb through the log files looking
>> for error messages that we know how to fix?
>>
>>
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>
>
>
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Re: [Emc-users] rapid prototype

[BRIAN GLACKIN]

This summer's Digital Machinist magazine has an article by Dave Mauch on
both retrofitting an existing 3 axis machine and the software to slice and
dice models into gcode.  Just recived a free copy in the mail last week.

On Mon, Jul 23, 2012 at 9:50 AM, Florian Rist  wrote:

> Hi Aram
>
> > Problem is in how from 3d surface/solid model generate G M code program
> > to move axis and govern the head?
>
> That's no problem at all, Skineforge doese exactly that:
>
>http://fabmetheus.crsndoo.com/wiki/index.php/Skeinforge
>
>
> See you
> Flo
>
>
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Re: [Emc-users] [Off] Ballscrew Support?

[andy pugh]

On 22 July 2012 23:32, Jeshua Lacock  wrote:

> Has anyone successfully machined the parts required?

A variant, yes:
https://picasaweb.google.com/lh/photo/9gDwFeKRO-e7uH17gD0ru9MTjNZETYmyPJy0liipFm0?feat=directlink
https://picasaweb.google.com/lh/photo/codwX5WaHkHyyW76-J-GxtMTjNZETYmyPJy0liipFm0?feat=directlink

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Re: [Emc-users] Docs/Messages

[Stuart Stevenson]

Belli,

You are probably correct about the dreaded 'shop owner'. But, if the
maintenance man, operator, or other individual in the chain can more easily
use the software then the 'shop owner' will more likely listen to the
person proposing the retrofit.


On Mon, Jul 23, 2012 at 11:38 AM, Belli Button  wrote:

> I think 'Shop owner resistance' stems from the fact that LCNC does not have
> an 0800 'Help desk' or 'call your nearest agent', etc.  There is no '30 day
> money back satisfaction guarantee' or 'Full refund if you are not
> completely
> satisfied' which is a something that everybody expects these days, figuring
> stuff out by yourself or having to get your hands dirty is an instant
> obstacle for many.  No UI that gave you hints of faults or a debug list is
> going to change human nature.
>
> Cheers,
>
>
>
>
> - Original Message -
> From: "Stuart Stevenson" 
> To: "Enhanced Machine Controller (EMC)" 
> Sent: Monday, July 23, 2012 5:44 PM
> Subject: Re: [Emc-users] Docs/Messages
>
>
> >I was thinking of having a debug level of messages interspersed in the
> > config files that when read would build a display of the program flow
> with
> > a 'token' showing where the control flow is currently. This would allow a
> > debug to pinpoint the stopping point and also watch the flow during the
> > development phase.
> >
> > this is just my idea of a possible solution to 'shop owner resistance'
> >
> > On Mon, Jul 23, 2012 at 10:18 AM, cogoman  wrote:
> >
> >> On 07/23/2012 10:45 AM, Stuart Stevenson wrote:
> >> > Maybe a debug gui with message tags at various places in the software
> >> > to
> >> > display the control flow and where the current tag is stopped.
> >>Are you thinking of a program to comb through the log files looking
> >> for error messages that we know how to fix?
> >>
> >>
> >>
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> >
> >
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> 
>
>
>
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Re: [Emc-users] Docs/Messages

[Viesturs Lācis]

2012/7/23 Belli Button :
> I think 'Shop owner resistance' stems from the fact that LCNC does not have
> an 0800 'Help desk' or 'call your nearest agent', etc.

I am building machines with LinuxCNC on it. _All_ of my contracts
include 24 month warranty, so I am that agent my clients are
calling...
The thing is that LinuxCNC is good enough that there are not really
much reasons for clients to call...

Stuart, I support Your point for whole 100%!!!
Here are few of my reasons:
1) LinuxCNC is open software, something that would ease
troubleshooting process, would definitely back this up;
2) that might help new users that are building their machines and are
not yet familiar with LinuxCNC;
3) I am trying to encourage my clients to learn about LinuxCNC so that
after a while with their new machine, when they have learned, what
things they might like to change, like adding some button in VCP, they
can actually do it on their own (keeping in mind that any problems due
to messing with basic config params is not covered by warranty - I
have backup of initial config, so it is possible to check for any
changes), so anything that would help to troubleshoot would be a big
help for my clients to be more independent with their machine - that
is what I wanted with my machines and that is one of my selling points
- they are not tied in with me as exclusive service provider for their
machine.


There is just that small and tiny problem of implementation...

-- 
Viesturs

If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] [Off] Ballscrew Support?

[Todd Zuercher]

Our first of these two machines actually had the racks and pinions replaced 
while still under factory warranty.  We are only cutting MDF with them (just 
lots of it).  The flaws I see with the machines are, spring loaded engagement 
of the pinion to rack, (lets pinion pull out of rack under heavy loads (like 
rapid accel), support bearings for the pinions and transmission shafts are to 
close together and overloaded.  I don't want to start dissing the Manufacturer 
they have stood behind the product, the machine design just isn't well suited 
for us and our application.  

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street 
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031
 


-- 
P. Graham Dunn
Phone:  330-828-2105
E-mail: to...@pgrahamdunn.com
630 Henry St.
Dalton, OH 44618
www.pgrahamdunn.com
-Original Message-
From: Viesturs Lācis [mailto:viesturs.la...@gmail.com] 
Sent: Monday, July 23, 2012 9:28 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] [Off] Ballscrew Support?

2012/7/23 Todd Zuercher :
> And the quality of the cut at
> federates above 200ipm leaves much to be desired compared to our
> similarly sized and specked ball screw driven machines.  To give them
> credit we are using them much harder than they were designed for, we
> run'em 24hr 5 days a week, and have more than twice as many machining
> hours on them than any other machine the manufacturer knows of.

Well, the last sentence explains it all.
Machine is 7 years old, so it means - life of racks is about 2-3
years. IMHO that is not bad, especially, when You mention the
conditions of their use.

And I am sure, that You know - running ballscrews over their rated
load would lead to the same result. Just that ballscrews could have
higher rated load...

I have racks and pinions in waterjet machine, they work very nice. I
like them, because their maintenance is something I can do myself. I
would not like to start changing balls in ballscrew or something like
that...

-- 
Viesturs

If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto




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Re: [Emc-users] [Off] Ballscrew Support?

[Viesturs Lācis]

2012/7/23 Todd Zuercher :
> Our first of these two machines actually had the racks and pinions replaced 
> while still under factory warranty.  We are only cutting MDF with them (just 
> lots of it).  The flaws I see with the machines are, spring loaded engagement 
> of the pinion to rack, (lets pinion pull out of rack under heavy loads (like 
> rapid accel), support bearings for the pinions and transmission shafts are to 
> close together and overloaded.  I don't want to start dissing the 
> Manufacturer they have stood behind the product, the machine design just 
> isn't well suited for us and our application.
>

Just out of curiousity: have You considered rebuilding it, making that
shaft longer and increasing distance between bearings and even put
"stronger" bearings there? I am sure that in longer term it would
provide cost savings - less downtime, less parts to replace etc.

-- 
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If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] rapid prototype

[Jeshua Lacock]

On Jul 23, 2012, at 12:01 AM, a...@conceptmachinery.com wrote:

> interesting if anyone used EMC to build rapid prototype machine.
> it should be 4 axis machine. 3 axis X Y Z and 4th axis head that 
> injects liquid wax -plastic.

Hi Aram,

There has been some discussion on this list recently converting mills to 3D 
plastic printers using EMC, see these threads:

[Emc-users] Status of Linux-emc and 3d printing?
[Emc-users] OT: 3D Printer Mods?
[Emc-users] SCARA robot arm 3D printer
[Emc-users] 3D Printer Parts
[Emc-users]  3D printer ( high end )
[Emc-users] OT: and Soapbox: 3D Printer Mods?
[Emc-users] Usefulness - was Re: OT: 3D Printer Mods?
[Emc-users] OT: 3D Printer Mods?
[Emc-users] 3D Printer Mods?

I would like to see a wax printer as well, but people have reported 
successfully performing a lost-plastic process with both ABS and PLA plastic. 
The process is the same as doing lost wax, but you burn out the plastic instead 
of wax. From what I read the PLA is safer/more pleasant to burn out (smells 
like maple syrup I read) but the ABS burned out cleaner. I am sure with some 
experimentation you could get great results from both.

That is what I primarily plan to do with a 3D printer and/or conversion when I 
get around to it.


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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[Emc-users] BASE_PERIOD and Intel D525MW boards

[John Stewart]

I've got a D525mw, and every once in a while it'll throw up an RTAI error.

At first I thought it was the update manager, but turning that off did not help.

my BASE_PERIOD is 30769; I wonder if that is way off the mark? Anyone with an 
Intel D525MW willing to tell me what you use?

(I'll admit to not knowing *which* latency number to choose from the stepconf 
screens, but, my mill seemed to work…)


Thank you;

John Stewart. 
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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[Gene Heskett]

On Monday 23 July 2012 22:16:53 John Stewart did opine:

> I've got a D525mw, and every once in a while it'll throw up an RTAI
> error.
> 
> At first I thought it was the update manager, but turning that off did
> not help.
> 
> my BASE_PERIOD is 30769; I wonder if that is way off the mark? Anyone
> with an Intel D525MW willing to tell me what you use?
> 

I have 2 of them, running at 23000 ns for a BASE_PERIOD.  I can run most of 
the day without encountering a realtime error.

I assume you also have the option set in the kernel line of your grub.conf 
(or menu.lst, depending on the mood of the distro divided by the phase of 
the moon) isolcpus=1, which reserves the 2nd core for the realtime stuff, 
and that you have the Hyperthreading option in the bios disabled as that 
will tear up the validity of the latency reported.

> (I'll admit to not knowing *which* latency number to choose from the
> stepconf screens, but, my mill seemed to work…)

It should, bearing mind mind that 3 may restrict your choices of 
microstep rates that are actually usable to the lower values of 8 and 
under.  Going to 23000 will make a noticeable difference in the machines 
top speed in that event. That also assumes you have stepper voltages high 
enough to make decent torque at those speeds. 24 is often borderline IMO, 
my mill is running a 28 volt supply, my lathe a 38 volt under load.

Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page:  is up!
Sorry, no fortune this time.

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Re: [Emc-users] The screw works!

[mark center]

I use 0 to 5 degree rake and 2 to 3 degrees absolute flank clearance.
The compound angle, viewed orthogonal to side view, is about 10 to 15
degrees. The spiral effect (lead angle) causes entering side to be
more acute than exit. Nothing is really terribly critical as long as a
cutting flank does not rub against either side of the thread flank.
Ridiculously acute appearing tool angles will cause less problems than
angles that would appear correct for turning, they just wear faster.
You might only be able to thread ten or fifteen parts before you need
to resharpen. The lead angle is a function of lead, diameter, and
whether internal/external.
I have a parting tool that I have threaded several times on a manual
South Bend Big 10 (and now a Monarch 10EE)

On Mon, Jul 23, 2012 at 7:52 AM, Gene Heskett  wrote:
> To Andy & Steve;
>
> I made another of the dual thread screws yesterday, and can report that it
> seems to work well.  However it seems that I must have a flexibility
> problem in using a cutoff knife sharpened with a 60 degree V and a slight
> (10 degree?) hook though.  Or it doesn't have sufficient 'heel' clearance
> and is being pushed until there is a supporting thread on both sides of the
> tooth.
>
> The entrance thread, even though the starting point of the fwd cutting
> stroke is well off the end of the workpiece, I am getting a 'first thread
> is bigger' effect, about 15 thou bigger TBE!  This was very obvious when I
> cut the 10-32 thread, slightly less so when I cut the 7mmx1.00, but
> required I trim about 2/3rds of the first thread off with a dremel diamond
> wheel.
>
> Two things became obvious, one being that I have no way to actually measure
> the pitch diameter of a thread in progress, and because of the fat end
> thread syndrome, it doesn't seem practical to try and use the matching
> threading die as an "am I done" test gage.  That, and the die I have seems
> to have several thou of thread clearance, so a hole tapped with the tap, is
> a pretty sloppy fit on a screw made by the matching die.  I like my threads
> to fit better than that.
>
> How much of a heel clearance angle do you folks use when sharpening a
> single tooth, and how much 'hook' on the top face?
>
> I want to make a jig for this as setting up the rotary table on the mill,
> and tipping it fwd to get the heel clearance angle seems to work but is a
> setup PIMA due to the tables motor hitting the heads gearbox.
>
> Cheers, Gene
> --
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>  soap, ballot, jury, and ammo. Please use in that order."
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