Re: [Emc-users] Metals question

[Gene Heskett]

On Monday 25 April 2016 19:43:53 Gene Heskett wrote:

And snipped.  I went out to the casting facility yesterday and they gave 
me a plug from one of their molds, about 35 lbs worth.

So I bring it home, & drag out my Dewalt 14" abrasive saw to try and get 
a clean cut on one end of it for a starter point.  Yeah, sure.  Saw has 
a 15 amp motor and I had to hit the wheel with a si-carbide stone 
dresser about every 15 seconds just to keep some sparks going.  Finally 
got it started somewhere near square, so I leaned on the saw to see if I 
could get the cutting fire started.  Tripped 15 amp breaker.  By this 
time the piece is up to 200F because this is a good 30 minutes after I 
started.
Reset breaker, leaned on it a little less and finally saw the fire again 
in about 2 minutes.  Obviously need two things, starting with a power 
hacksaw, but I don't have any room left for such a toy.

Anyway it cut like it should have for about 3/16", seemed to bind the 
wheel and tripped a 20 amp breaker. I get the impression that the 
relative lack of abrasive on the sides of the wheel is causing a narrow 
burn that in about 1/8 to 3/16" of cut, is pinching the wheel.

The big end, just short of 4.5" in diameter, what would have been the top 
of the casting plug is convex and offers no purchase to put a hold-down 
jig, else I'd consider putting it on the mill table.  And while I could 
go get a vise to hold it, I wouldn't dare try to pick up such a vise 
with my back and it may be too tall.  And I lack a steel plate heavy 
enough to set it in the middle of a clay dam about 3/4" high with a 1/4" 
of fresh wet epoxy in it.  If I did, then I have an 8 tooth carbide 
tipped saw blade intended as a replacement blade for my Porter-Cable 
#557 plate jointer, and an arbor to put it in the mills 3/4" R-8 collet 
and would start tracing a circle around it, uhh, the blade is 4.5" OD so 
the total motion exceeds my Y range, so the best I could do is sweep it 
over the range I have, advancing sideways at 5 thou a sweep.  And I 
wouldn't be halfway thru it by the time the arbor hub would hit it.

About that time a ups truck pulled up and set a big box out, which had 
the double bowl laundry tub my baby wanted, as a kit I had to assemble. 
I needed a break from the saw and the frustration of that, so I unpacked 
it and assembled it on a table on the front deck, discovering in the 
process of mounting the drain assembly, that the special tail pipe with 
a dishwasher connection on the side, was rigged at molding time to screw 
directly to the drains threads and couldn't be used as a tailpiece 
extension on the existing single downtube from the double basin 
assembly.  So I need to go find one that can.  But we hauled it to the 
basement, where I found I'll have to move the upright freezer about 8" 
to the left before it will fit the space.  Luverly.

And, while I was pulling sink parts out of the box, a fedex van pulled up 
and handed me that 920 oz motor about 3 days early.  But I didn't have 
anything left of me by then to play with putting it on, so its "on the 
shelf" & we are almost back on topic. :)

And its intermittently pouring it out of the green giants boots this 
morning & no promise of warm sunny, work outdoors weather now till next 
week.

I hadn't figured on putting the motor on until the driver was here too 
since the driver and psu I have are a bit small for amperage.  It needs 
6.1 amps a phase wired bipolar-parallel according to the charts I dl'd 
and printed FFR. But it doesn't say peak or RMS so I'll set the drivers 
dip switches for about that & act fat, dumb and happy (till it doesn't 
work), but its a 3.3mh per winding motor, which compared to the 23mh of 
what I have now, ought to march along at a pretty good clip.  The line 
powered driver says it can do up to 9.something for nema 34/42 motors. 
But its still on the boat I think. I've a tracking number so I'll use it 
before I go looking for a dishwasher drain entry that is a real 
tailpiece extension.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] OT: spindle nose

[Roland Jollivet]

Hi All

Referring to the picture on this site;
http://www.tailiftgroup.com/cnc-vmc/images/TMV-1165_img002.jpg

Can anyone tell me what those 10 holes surrounding the drive dogs are for?
I see them on a number of spindles, but they never appear in the
cross-section diagrams.

Air blast? Or maybe the drive dog section is removable? But that would be
the worst place to compromise the integrity of the cone..

Regards
Roland
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Re: [Emc-users] OT: spindle nose

[andy pugh]

On 26 April 2016 at 17:57, Roland Jollivet  wrote:
> Referring to the picture on this site;
> http://www.tailiftgroup.com/cnc-vmc/images/TMV-1165_img002.jpg
>
> Can anyone tell me what those 10 holes surrounding the drive dogs are for?

The holes are part of the spindle standards:
http://s200.photobucket.com/user/oldtiffie/media/machine_tapers/Machine-taper5.jpg.html

I have heard that there are big face-mills that use them. I have never
seen one.

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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[Emc-users] OT: spindle nose

[Roland Jollivet]

Thanks Andy.
..

On 26 April 2016 at 19:14, andy pugh  wrote:

> On 26 April 2016 at 17:57, Roland Jollivet 
> wrote:
> > Referring to the picture on this site;
> > http://www.tailiftgroup.com/cnc-vmc/images/TMV-1165_img002.jpg
> >
> > Can anyone tell me what those 10 holes surrounding the drive dogs are
> for?
>
> The holes are part of the spindle standards:
>
> http://s200.photobucket.com/user/oldtiffie/media/machine_tapers/Machine-taper5.jpg.html
>
> I have heard that there are big face-mills that use them. I have never
> seen one.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
>
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> Manager
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Re: [Emc-users] PCB circuit board drill file

[Erik Friesen]

I don't know what you are using for PCB software, but I have done this
using diptrace and vcarve.

It works best to use a ground plane with spokes to all pads, then you
export using the dxf offset feature, and run those lines right on top.

On Tue, Apr 26, 2016 at 1:04 AM, Nicklas Karlsson <
nicklas.karlsso...@gmail.com> wrote:

> > On 04/25/2016 11:56 AM, Nicklas Karlsson wrote:
> > > I am looking at using linuxcnc to drill my circuit boards. There is a
> few commands in file, a tool table and coordinates. It is not possible run
> the file directly in linuxcnc. I think this kind of file could be of
> general use then a pattern of holes need to be drilled. Do anyone have any
> suggestions on how to attack it?
>
> I could in sort of see g-code in the excellon drill files but linuxcnc
> where not able to read. I also assumed many used Excellon drill files
> before. It useful both for circuit boards and picking coordinates for heat
> sink.
>
> > Although Excellon drill files are technically a dialect of
> > RS-274D (alias G-code) they are pretty far from modern
> > dialects.  I wrote a program to convert it to standard
> > G-code.  See :
> > http://pico-systems.com/codes/cvtexc2.c
> > and
> > http://pico-systems.com/codes/cvtexcm.c
> >
> > The first one assumes input AND output are in inch units,
> > the 2nd one takes mm in and converts to inches.
> >
> > It has been a LONG time since I used these, so definitely
> > use at YOUR PERIL!
> >
> > Probably the first program will work fine reading in mm and
> > outputting mm if you just adjust where the assumed decimal
> > point is.  The code should be pretty transparent if you know c.
> >
> > Jon
> >
> >
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Re: [Emc-users] PCB circuit board drill file

[Nicklas Karlsson]

The lines I etch but there is a drill file for the holes. I already found two 
converters from Excellon drill file to suitable g-code.



On Tue, 26 Apr 2016 21:19:59 -0400
Erik Friesen  wrote:

> I don't know what you are using for PCB software, but I have done this
> using diptrace and vcarve.
> 
> It works best to use a ground plane with spokes to all pads, then you
> export using the dxf offset feature, and run those lines right on top.
> 
> On Tue, Apr 26, 2016 at 1:04 AM, Nicklas Karlsson <
> nicklas.karlsso...@gmail.com> wrote:
> 
> > > On 04/25/2016 11:56 AM, Nicklas Karlsson wrote:
> > > > I am looking at using linuxcnc to drill my circuit boards. There is a
> > few commands in file, a tool table and coordinates. It is not possible run
> > the file directly in linuxcnc. I think this kind of file could be of
> > general use then a pattern of holes need to be drilled. Do anyone have any
> > suggestions on how to attack it?
> >
> > I could in sort of see g-code in the excellon drill files but linuxcnc
> > where not able to read. I also assumed many used Excellon drill files
> > before. It useful both for circuit boards and picking coordinates for heat
> > sink.
> >
> > > Although Excellon drill files are technically a dialect of
> > > RS-274D (alias G-code) they are pretty far from modern
> > > dialects.  I wrote a program to convert it to standard
> > > G-code.  See :
> > > http://pico-systems.com/codes/cvtexc2.c
> > > and
> > > http://pico-systems.com/codes/cvtexcm.c
> > >
> > > The first one assumes input AND output are in inch units,
> > > the 2nd one takes mm in and converts to inches.
> > >
> > > It has been a LONG time since I used these, so definitely
> > > use at YOUR PERIL!
> > >
> > > Probably the first program will work fine reading in mm and
> > > outputting mm if you just adjust where the assumed decimal
> > > point is.  The code should be pretty transparent if you know c.
> > >
> > > Jon
> > >
> > >
> > --
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> > Manager
> > > Applications Manager provides deep performance insights into multiple
> > tiers of
> > > your business applications. It resolves application problems quickly and
> > > reduces your MTTR. Get your free trial!
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> >
> >
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