Re: [Emc-users] off sub geography

2014-02-19 Thread John Thornton
I have Wildblue and it is ok, I think it is the same as Exceed just a 
different name. Hugesnet is a rip off big time.

JT

On 2/18/2014 8:09 PM, Jon Elson wrote:
 On 02/18/2014 12:45 PM, Stuart Stevenson wrote:
 We could probably have internet with cell service.
 4G is fast



 Well, I've thought about it.  This friend is thinking about
 providing
 internet access to the island in the Pacific he just bought
 95% of.
 It is 300 miles from anyplace that has actual habitation, so
 even
 going there to just SEE it is a major problem.  But, I
 looked into
 remote site internet, and exede is a very cool system, with
 a reasonable price.  At some point he may want to move
 forward with
 it and I will be building and testing a totally self-contained
 satellite node with solar power.  But, it might be a while
 before
 he gets ready to try nuts and bolts.

 There is no/very spotty ATT service right at the cabin, but if
 you walk 50 feet up the hill, you get good reception to the
 mini-cell at Montauk lodge.  So, it might take a long cord.

 Jon

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Re: [Emc-users] Knee mill conversion - Z axis questions

2014-02-19 Thread John Alexander Stewart
Jeremy, Jon;

Good answers.

Jon - yes, it's a horizontal mill, but I have the geared head with quill,
and have only used the horizontal arm once, so apologies for forgetting
that it's a horizontal mill originally.

Jeremy - I had not thought of putting a stepper on the quill feed -
interesting idea for sure.

The idea was indeed to use the bevel gearing and feed screw for
raising/lowering the whole knee, table included, and locking the spindle.

I think some testing is required for the knee - see if it slides smoothly,
as per Jon's remarks. Most of the time the Knee is just locked in place, so
I don't expect any wear there.

I know Andy did a Horizontal - I'll have to find his pictures somewhere,
and see what he did.

Thank you for the feedback - I appreciate the experience that you guys have
shown.

John.


On Wed, Feb 19, 2014 at 12:00 AM, Jon Elson el...@pico-systems.com wrote:

 On 02/18/2014 07:59 PM, John Alexander Stewart wrote:
  Hi all; may be off topic, but am wondering about converting my Centec 2B
  mill to CNC. X,Y axes are relatively easy; Z is difficult.
 
  Is there any real need to convert the Z axis, assuming that the weight of
  the table will keep the backlash to a minimum, or am I way off base here?
 
 Is this a horizontal mill?  That's what I get with a search.
 The left-right table is still the X axis, but the Z is the
 toward/
 away from the operator, as it is parallel to the spindle.
 The knee crank is the Y axis.  This is necessary to make the
 axes follow the right hand rule.  On some old machines, the
 rocking of the knee can cause it to bind and not always
 drop when the crank is lowered.  If that doesn't happen, then
 the only thing you need to worry about is backlash on
 the bevel gears of the elevating crank.

 Jon


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Re: [Emc-users] off sub geography

2014-02-19 Thread Dave Cole
What system does Dishnetwork use for internet via satellite?

Dave

On 2/19/2014 6:19 AM, John Thornton wrote:
 I have Wildblue and it is ok, I think it is the same as Exceed just a
 different name. Hugesnet is a rip off big time.

 JT

 On 2/18/2014 8:09 PM, Jon Elson wrote:
 On 02/18/2014 12:45 PM, Stuart Stevenson wrote:
 We could probably have internet with cell service.
 4G is fast



 Well, I've thought about it.  This friend is thinking about
 providing
 internet access to the island in the Pacific he just bought
 95% of.
 It is 300 miles from anyplace that has actual habitation, so
 even
 going there to just SEE it is a major problem.  But, I
 looked into
 remote site internet, and exede is a very cool system, with
 a reasonable price.  At some point he may want to move
 forward with
 it and I will be building and testing a totally self-contained
 satellite node with solar power.  But, it might be a while
 before
 he gets ready to try nuts and bolts.

 There is no/very spotty ATT service right at the cabin, but if
 you walk 50 feet up the hill, you get good reception to the
 mini-cell at Montauk lodge.  So, it might take a long cord.

 Jon

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Re: [Emc-users] Knee mill conversion - Z axis questions

2014-02-19 Thread Jon Elson
On 02/19/2014 06:45 AM, John Alexander Stewart wrote:
 Jeremy, Jon;

 Good answers.

 Jon - yes, it's a horizontal mill, but I have the geared head with quill,
 and have only used the horizontal arm once, so apologies for forgetting
 that it's a horizontal mill originally.


OK, so you want to rig the Z drive to the quill, or the 
knee?  I already
addressed the knee part, so I can pretty much see the quill 
drive
looks like a rack and pinion system.  These typically have a 
LOT of
backlash, and so are not a good choice for a live axis.

On Bridgeport-like machines, they have an adjustable stop 
contraption
on the front of the head that exposes a threaded hole in the 
quill
through a slot.  This is a great place to attach a ballscrew 
drive
and you remove the pinion.  But, a picture of the vertical head
on the 2B seems to indicate you don't have this kind of access
the way the machine is built.  I seriously doubt you can do 
milling
work without locking the quill, which kind of defeats the 
purpose
of having a controlled CNC axis.  So, I'm not sure this is a
viable option.

Jon

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Re: [Emc-users] off sub geography

2014-02-19 Thread Jon Elson
On 02/19/2014 08:51 AM, Dave Cole wrote:
 What system does Dishnetwork use for internet via satellite?


I believe dish is one-way download only.  So, you command 
what you
want to load via a phone modem, and they send everybody's
downloads on one channel on the satellite.  I can only 
imagine the
performance has to be pretty bad.

Jon

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Re: [Emc-users] Knee mill conversion - Z axis questions

2014-02-19 Thread John Alexander Stewart
Jon;

OK, so you want to rig the Z drive to the quill, or the
 knee?


Knee. Apologies for responding before the coffee had kicked in, and my
ability to put thoughts down in text not cranked up.


 I already
 addressed the knee part, so I can pretty much see the quill
 drive
 looks like a rack and pinion system.  These typically have a
 LOT of
 backlash, and so are not a good choice for a live axis.


I agree with this - the thought was to just lock the quill, and use Z by
the knee only.

Interesting point about the Bridgeport quill arrangement; the Centec one is
more basic.

I'll (attempt to) do some tests to see how well the knee moves this
weekend. As mentioned, generally, it's just locked into place and left
until it needs moving again (which can be months)
so I'm not experienced in using it for actually dialling in a cut.

Thank you again - John.
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Re: [Emc-users] off sub geography

2014-02-19 Thread Gene Heskett
On Wednesday 19 February 2014 15:38:38 Jon Elson did opine:

 On 02/19/2014 08:51 AM, Dave Cole wrote:
  What system does Dishnetwork use for internet via satellite?
 
 I believe dish is one-way download only.  So, you command
 what you
 want to load via a phone modem, and they send everybody's
 downloads on one channel on the satellite.  I can only
 imagine the
 performance has to be pretty bad.
 
 Jon
 
Its legendarily crappy Jon, but if its the only game in town...


Cheers, Gene
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complete probe assembly.


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Re: [Emc-users] Knee mill conversion - Z axis questions

2014-02-19 Thread Gene Heskett
On Wednesday 19 February 2014 15:40:19 John Alexander Stewart did opine:

 Jon;
 
 OK, so you want to rig the Z drive to the quill, or the
 
  knee?
 
 Knee. Apologies for responding before the coffee had kicked in, and my
 ability to put thoughts down in text not cranked up.
 
  I already
  addressed the knee part, so I can pretty much see the quill
  drive
  looks like a rack and pinion system.  These typically have a
  LOT of
  backlash, and so are not a good choice for a live axis.
 
 I agree with this - the thought was to just lock the quill, and use Z by
 the knee only.
 
 Interesting point about the Bridgeport quill arrangement; the Centec one
 is more basic.
 
 I'll (attempt to) do some tests to see how well the knee moves this
 weekend. As mentioned, generally, it's just locked into place and left
 until it needs moving again (which can be months)
 so I'm not experienced in using it for actually dialling in a cut.
 
 Thank you again - John.

Generally that movement is limited to a foot to 18 or so, and a big ball 
screw positioned under its rough center of gravity, and a couple heavy 
thrust nitrogen lift struts on each side of the screw to help it going back 
up, ought to get it to the point where a turning nut driven by a nema 34 
should be able to do it as long as the speeds expected weren't too 
unreasonable.  I can just barely make 34 ipm on my toy, moving the much 
lighter head up and down the square post with a clamped down quill with a 
nema 23, 425oz rated running the turning nut, but the motor psu is only 28 
volts. 45 volts would make a huge diff.

Bear in mind that you would need buckets of torque at driving a big drill 
bit at machinery handbook speeds though unless you also put something on 
the quill rack just for drilling holes, so the nema 34 should probably be 
at least a double stack.  And of coarse the turning nut means that nema 
34 is hanging on, and is part of the weight of the knee to move.

On my toy of coarse, I'm out of spindle power with only a 1/4 drill doctor 
sharpened 1/4 in the chuck.  Sniff...  But I can drive it cutting thin 
strips the first 3/4 deep before I start pecking  clearing.

Just sayin... ;-)

 
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Re: [Emc-users] Knee mill conversion - Z axis questions

2014-02-19 Thread Steve Blackmore
On Tue, 18 Feb 2014 20:59:08 -0500, you wrote:

Hi all; may be off topic, but am wondering about converting my Centec 2B
mill to CNC. X,Y axes are relatively easy; Z is difficult.

Is there any real need to convert the Z axis, assuming that the weight of
the table will keep the backlash to a minimum, or am I way off base here?

Thanks for any advice from those who may have gone down this path before
me;

Hi John - I had a Centec 2B with powerfeed and lots of horizontal
tooling. The important bits were tatty looking but in very good
condition under the grime. The X axis screw/nut design was pretty
appalling though. Getting the adjustment just right so it didn't jump
out of drive on reverse was a work of art. The table was heavy to raise
with lots of backlash in the bevel gears. I had the geared vertical head
too - that was very nice and had hardly been used. Some idiot had filled
the oil reservoir with grease and I had to strip it to clean. Getting
the bearing pre load correct after was difficult and I had to make a few
tools to do it. Fortunately the very expensive bearings were undamaged
and after fitting a new bottom oil seal it was fine. Guessing, I would
say that it leaked oil and to fix that they substituted grease!

Although a very usable manual mill, I wouldn't attempt to CNC one. Not
an easy conversion. More importantly they are a bit cult over here and
fetch premium prices. I did renovate mine fully and repaint it before
selling it on and I made a hefty profit - you could buy a working second
hand Boss Bridgeport for what I got for mine!

There are some details here.

http://www.pilotltd.net/centec_2b_mill.htm

please ignore rest of site - so out of date :)

Steve Blackmore
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Re: [Emc-users] off sub geography

2014-02-19 Thread Dave Cole
There new system is up and down satellite.   No phone link required.

It has mixed reviews but the cost is not that high considering it is sat 
link.

Dave

On 2/19/2014 11:58 AM, Jon Elson wrote:
 On 02/19/2014 08:51 AM, Dave Cole wrote:
 What system does Dishnetwork use for internet via satellite?


 I believe dish is one-way download only.  So, you command
 what you
 want to load via a phone modem, and they send everybody's
 downloads on one channel on the satellite.  I can only
 imagine the
 performance has to be pretty bad.

 Jon

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Re: [Emc-users] off sub geography

2014-02-19 Thread Peter Blodow
Wish I could be with you, at whatever you're planning, but it's a bit 
far from where we live

Peter Blodow from Whrenberg,
Bavaria, Germany

Am 18.02.2014 18:08, schrieb Jon Elson:
 On 02/18/2014 04:21 AM, Mark Wendt wrote:
 Eminence is about 103 miles from my buddy's place and
 Alton is even closer at around 70 miles. H. ;-) Mark
 Hmmm, maybe we should have an Ozarks CNC fest sometime, or
 just a get together.  The location is primitive, there is
 electricity,
 but no internet.  At the moment, running water may be a problem,
 as my friend's nephew used the place in January and burst some
 pipes.  Not clear how much fixing that is going to take.
 But, anyway,
 we usually go out there in late July or early August.  If
 several of
 us wanted to get together for a couple days of fishing, floating
 on the river and bull sessions, I think I could arrange it.

 My friend has an air compressor and about 15 assorted truck
 inner tubes that are great for floating on the river.

 Jon

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Re: [Emc-users] Knee mill conversion - Z axis questions

2014-02-19 Thread John Alexander Stewart
Steve - Ah, that's your site - found it recently. ;-)

Although a very usable manual mill, I wouldn't attempt to CNC one. Not
 an easy conversion. More importantly they are a bit cult over here and
 fetch premium prices. I did renovate mine fully and repaint it before
 selling it on and I made a hefty profit - you could buy a working second
 hand Boss Bridgeport for what I got for mine!


 That's probably a good idea. I could go the G0704 style of mill, purchase
the kit of parts, and be ahead of the game in terms of the time to get up
and running.

Hmmm. The Centec is in the basement, and I do like it, and my wife likes
the retro feel. Hmmm

John.
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Re: [Emc-users] off sub geography

2014-02-19 Thread Stuart Stevenson
Jon,
  Do you have a people limit?

Peter,
  Wish you could be here.

I haven't seen it - I have only heard about it but they have boat races on
the Current River in Eminence. They put a 60-80 hp outboard on a 14 foot
jon boat and survive the fun.



On Wed, Feb 19, 2014 at 3:42 PM, Peter Blodow p.blo...@dreki.de wrote:

 Sorry, Ehrenberg

 Am 19.02.2014 22:37, schrieb Peter Blodow:
  Wish I could be with you, at whatever you're planning, but it's a bit
  far from where we live
 
  Peter Blodow from Whrenberg,
  Bavaria, Germany
 
  Am 18.02.2014 18:08, schrieb Jon Elson:
  On 02/18/2014 04:21 AM, Mark Wendt wrote:
  Eminence is about 103 miles from my buddy's place and
  Alton is even closer at around 70 miles. H. ;-) Mark
  Hmmm, maybe we should have an Ozarks CNC fest sometime, or
  just a get together.  The location is primitive, there is
  electricity,
  but no internet.  At the moment, running water may be a problem,
  as my friend's nephew used the place in January and burst some
  pipes.  Not clear how much fixing that is going to take.
  But, anyway,
  we usually go out there in late July or early August.  If
  several of
  us wanted to get together for a couple days of fishing, floating
  on the river and bull sessions, I think I could arrange it.
 
  My friend has an air compressor and about 15 assorted truck
  inner tubes that are great for floating on the river.
 
  Jon
 
 
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Re: [Emc-users] off sub geography

2014-02-19 Thread Gregg Eshelman
On 2/19/2014 9:58 AM, Jon Elson wrote:
 On 02/19/2014 08:51 AM, Dave Cole wrote:
 What system does Dishnetwork use for internet via satellite?


 I believe dish is one-way download only.  So, you command
 what you
 want to load via a phone modem, and they send everybody's
 downloads on one channel on the satellite.  I can only
 imagine the
 performance has to be pretty bad.

The early satellite internet systems were download only, and required a 
dialup modem (or other link, but if you had access to better than 
dialup, you wouldn't need satellite) for the uplink.

Wild Blue is one of several two way satellite internet service 
providers. US regulations require two way satellite communications 
systems to be installed by licensed/certified personnel. The slightest 
bit off angle can have the uplink beam missing the satellite or hitting 
the wrong one which could cause interference.

The Hughes service has been bounced around many owners or names, at one 
time it was wholly owned by DirecTV as DirecPC.


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[Emc-users] CNC a Hardinge TM or UM mill?

2014-02-19 Thread Gregg Eshelman
Has anyone done a CNC conversion on a Hardinge TM or UM?

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Re: [Emc-users] CNC a Hardinge TM or UM mill?

2014-02-19 Thread TERRY Christophersen
I have always wanted one but usually they go for more money than
what I think they should . I think one would make a good choice.

Terry
On Feb 19, 2014 5:56 PM, Gregg Eshelman g_ala...@yahoo.com wrote:

 Has anyone done a CNC conversion on a Hardinge TM or UM?


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Re: [Emc-users] CNC a Hardinge TM or UM mill?

2014-02-19 Thread Ralph Stirling
I have thought a UM would make a neat conversion to
a small gang-tooled lathe.  It already has a 5C collet
in the horizontal spindle.

-- Ralph

From: Gregg Eshelman [g_ala...@yahoo.com]
Sent: Wednesday, February 19, 2014 3:54 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] CNC a Hardinge TM or UM mill?

Has anyone done a CNC conversion on a Hardinge TM or UM?

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Re: [Emc-users] off sub geography

2014-02-19 Thread Jon Elson
On 02/19/2014 04:41 PM, Stuart Stevenson wrote:
 Jon,
Do you have a people limit?


No, not really, as long as the weather is good.  There are 
some tricky
details.  The road down to the cabin is quite rough, we do 
it in a
Honda van, but it is tricky, and if it rains we park at the 
top and
walk down rather than get stuck.  So, a car with substantial 
ground
clearance is pretty mandatory.  Second, we don't usually get
cell service at the cabin, and have to hike up the hill a 
bit to use
ATT roaming, which allows us on a bandwidth-available lowest
priority mode, I think.  So, you can make a short call, but 
usually
get cut off after a minute or two.  No voice mail access, 
and most
of our phones don't have text service.  So, coordinating people
who want to drop by will take a little logistics, like 
knowing when to
hike up the hill to be in phone contact.  I suppose one way 
to deal
with it would be to have everybody meet in the Montauk Lodge
parking lot and then follow us.   Hmmm, actually, there isn't
a people limit, but a parking limit.  Although there is a flat
place at the top of the hill where several vehicles could
be parked.

Anyway, there is this fairly small cabin with two sleeping 
porches
where we can drag out bunk beds.  If it gets too big, then
we have an overload of bathroom and cooking facilities.
But, we did have 20 people out there once and made it work.

As for boat races, in the upper Current, it is so small and 
shallow,
that canoes sometimes have difficulty passing.

Before anything serious gets set up, I will have to make sure it
is OK with my friend (I'm pretty sure he will be OK with it)
and that the plumbing situation can be fixed in time.  Plenty
of time for that if this is going to happen in late summer.

Jon

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Re: [Emc-users] off sub geography

2014-02-19 Thread jeremy youngs
walk down rather than get stuck.  So, a car with substantial
ground
clearance is pretty mandatory.  Second, we don't usually get
cell service at the cabin, and have to hike up the hill a
bit to use
ATT roaming, which allows us on a bandwidth-available lowest
priority mode, I think.  So, you can make a short call, but
usually


yep, sounds like south central mo :)




jeremy youngs


On Wed, Feb 19, 2014 at 9:16 PM, Jon Elson el...@pico-systems.com wrote:

 On 02/19/2014 04:41 PM, Stuart Stevenson wrote:
  Jon,
 Do you have a people limit?
 
 
 No, not really, as long as the weather is good.  There are
 some tricky
 details.  The road down to the cabin is quite rough, we do
 it in a
 Honda van, but it is tricky, and if it rains we park at the
 top and
 walk down rather than get stuck.  So, a car with substantial
 ground
 clearance is pretty mandatory.  Second, we don't usually get
 cell service at the cabin, and have to hike up the hill a
 bit to use
 ATT roaming, which allows us on a bandwidth-available lowest
 priority mode, I think.  So, you can make a short call, but
 usually
 get cut off after a minute or two.  No voice mail access,
 and most
 of our phones don't have text service.  So, coordinating people
 who want to drop by will take a little logistics, like
 knowing when to
 hike up the hill to be in phone contact.  I suppose one way
 to deal
 with it would be to have everybody meet in the Montauk Lodge
 parking lot and then follow us.   Hmmm, actually, there isn't
 a people limit, but a parking limit.  Although there is a flat
 place at the top of the hill where several vehicles could
 be parked.

 Anyway, there is this fairly small cabin with two sleeping
 porches
 where we can drag out bunk beds.  If it gets too big, then
 we have an overload of bathroom and cooking facilities.
 But, we did have 20 people out there once and made it work.

 As for boat races, in the upper Current, it is so small and
 shallow,
 that canoes sometimes have difficulty passing.

 Before anything serious gets set up, I will have to make sure it
 is OK with my friend (I'm pretty sure he will be OK with it)
 and that the plumbing situation can be fixed in time.  Plenty
 of time for that if this is going to happen in late summer.

 Jon


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Re: [Emc-users] kinematics of 3 joint and 6 joint serial robots

2014-02-19 Thread Marius Alksnys
Rudy,

I tried your robot6kins module, had to invert some joints due to 
different joint directions on my robot. It seems that my DH parameters 
are correct - I tested different positions and checked XYZ coordinates 
offline. But I get following errors when changing to world mode when 
powered-on. And I get the same results with different angles of all joints.

Could you please send me those missing files for motoman-sim?

Thanks in advance,
Marius


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