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Search: Posts Made By: Gerald D
Forum: Miscellaneous / General / Whatever / Catchall Wed 20 June 2012, 14:11
Replies: 308
Views: 298,967
Posted By Gerald D
Hence my suggestion to use an encoder and measure...

Hence my suggestion to use an encoder and measure the quality of a drive system.
Forum: Miscellaneous / General / Whatever / Catchall Mon 18 June 2012, 11:25
Replies: 308
Views: 298,967
Posted By Gerald D
PS. I don't think this has anything to do with a...

PS. I don't think this has anything to do with a motor's natural resonance. I think we are talking about a motor's ability to use micro-steps to fight its inherent detents. We see an oscillating...
Forum: Miscellaneous / General / Whatever / Catchall Mon 18 June 2012, 11:20
Replies: 308
Views: 298,967
Posted By Gerald D
Brian, when you cut circles, the speed of a motor...

Brian, when you cut circles, the speed of a motor has to go from zero to max, and it has to cover all speeds. You cannot decide to stay away from a certain speed.
Forum: Miscellaneous / General / Whatever / Catchall Sun 17 June 2012, 23:27
Replies: 308
Views: 298,967
Posted By Gerald D
This discussion has been repeated many times. We...

This discussion has been repeated many times. We have yet to prove, and accept, that micro-stepping of stepper motors simply doesn't perform perfectly under all conditions. All of our theory on cut...
Forum: Miscellaneous / General / Whatever / Catchall Sat 16 June 2012, 03:51
Replies: 308
Views: 298,967
Posted By Gerald D
When cutting a gentle curve with two motors, one...

When cutting a gentle curve with two motors, one of the motors may not actually be driving - that motor could be acting as a brake, counteracting the sideways cutting force of the spinning cutter....
Forum: Miscellaneous / General / Whatever / Catchall Sat 16 June 2012, 00:02
Replies: 308
Views: 298,967
Posted By Gerald D
Seeing it on a scope would be pretty, but not...

Seeing it on a scope would be pretty, but not essential. For me it is enough to know how many pulses the encoder output lags behind the input under certain conditions, and to know what conditions...
Forum: Miscellaneous / General / Whatever / Catchall Fri 15 June 2012, 10:54
Replies: 308
Views: 298,967
Posted By Gerald D
From...

From http://www.geckodrive.com/support/step-motor-basics.html, there is this part:

13329

It would be interesting to see how our typical Nema 34 motors behave themselves.

How can we help...
Forum: Miscellaneous / General / Whatever / Catchall Thu 14 June 2012, 09:59
Replies: 308
Views: 298,967
Posted By Gerald D
Mike, here is a proposal for a definitive...

Mike, here is a proposal for a definitive experiment:

Take a 200 pulse per rev stepper motor on a test bench,
with a large & accessible coupling driving to
a 2000 step/rev encoder

Drive...
Forum: Miscellaneous / General / Whatever / Catchall Sat 29 January 2011, 05:26
Replies: 308
Views: 298,967
Posted By Gerald D
You don't a spring to make something...

You don't a spring to make something springloaded. Sometimes you just use the flex in the mounting to keep a load on the system.
Forum: Miscellaneous / General / Whatever / Catchall Fri 28 January 2011, 04:25
Replies: 308
Views: 298,967
Posted By Gerald D
http://www.brighthub.com/engineering/mechanical/ar...

http://www.brighthub.com/engineering/mechanical/articles/65169.aspx
Forum: Miscellaneous / General / Whatever / Catchall Sat 06 November 2010, 21:31
Replies: 308
Views: 298,967
Posted By Gerald D
Mike (Richards), that post was not called for....

Mike (Richards), that post was not called for. There is a real chance that if Kim's (and some others) posting of their non-MM machines continues, that I (and some others) will stop reading and taking...
Forum: Miscellaneous / General / Whatever / Catchall Sat 06 November 2010, 13:21
Replies: 308
Views: 298,967
Posted By Gerald D
Kim, I am not in the mood for word games...... ...

Kim, I am not in the mood for word games......

This is the MechMate forum. It is privately owned. The owner decides who is allowed here or not. End of story.
Forum: Miscellaneous / General / Whatever / Catchall Sat 06 November 2010, 11:53
Replies: 308
Views: 298,967
Posted By Gerald D
Kim, the title of this thread is MechMates...

Kim, the title of this thread is MechMates already cutting (http://www.mechmate.com/forums/forumdisplay.php?f=78) - what you have here no longer resembles a MechMate.

I was the one that suggested...
Forum: Miscellaneous / General / Whatever / Catchall Wed 27 October 2010, 21:18
Replies: 308
Views: 298,967
Posted By Gerald D
. . . . or think twice about disclosing full...

. . . . or think twice about disclosing full names and/or addresses
Forum: Miscellaneous / General / Whatever / Catchall Wed 27 October 2010, 20:54
Replies: 308
Views: 298,967
Posted By Gerald D
The scary thought is that the thief knew what he...

The scary thought is that the thief knew what he was targeting, and that he could be a member on this forum or any other that Kim posts on. :mad:
Forum: Miscellaneous / General / Whatever / Catchall Sat 23 October 2010, 14:33
Replies: 308
Views: 298,967
Posted By Gerald D
That wooden cover acts as a heat insulator and...

That wooden cover acts as a heat insulator and makes the motor run hotter.
Forum: Miscellaneous / General / Whatever / Catchall Sun 14 March 2010, 06:31
Replies: 308
Views: 298,967
Posted By Gerald D
See also Heavy duty Wood CNC in Denmark...

See also Heavy duty Wood CNC in Denmark (http://www.cnczone.com/forums/showthread.php?t=101315) on the CNCzone.
Forum: Miscellaneous / General / Whatever / Catchall Sun 22 February 2009, 10:59
Replies: 308
Views: 298,967
Posted By Gerald D
Welcome back Kim!

Welcome back Kim!
Forum: Miscellaneous / General / Whatever / Catchall Sun 29 June 2008, 13:21
Replies: 308
Views: 298,967
Posted By Gerald D
Some nice welding on those box corners!

Some nice welding on those box corners!
Forum: Miscellaneous / General / Whatever / Catchall Wed 02 April 2008, 10:44
Replies: 308
Views: 298,967
Posted By Gerald D
Ah, you made a grinding skate today just for fun!...

Ah, you made a grinding skate today just for fun! :)
Forum: Miscellaneous / General / Whatever / Catchall Wed 02 April 2008, 09:56
Replies: 308
Views: 298,967
Posted By Gerald D
Have you cut the rail to final length before...

Have you cut the rail to final length before using the grinding skate?
Forum: Miscellaneous / General / Whatever / Catchall Mon 31 March 2008, 11:06
Replies: 308
Views: 298,967
Posted By Gerald D
Paul, the "racking" concern vanishes when the...

Paul, the "racking" concern vanishes when the table top is screwed down. The table top itself simply cannot "rack".
Forum: Miscellaneous / General / Whatever / Catchall Fri 25 January 2008, 00:58
Replies: 308
Views: 298,967
Posted By Gerald D
Mike, I think the CNC zone guys are over-reacting...

Mike, I think the CNC zone guys are over-reacting to the "heatsink" not being good enough for a faulty rectifier. The metal case rectifiers are typically good for 25 Amps without any heatsink. On our...
Forum: Miscellaneous / General / Whatever / Catchall Thu 24 January 2008, 20:09
Replies: 308
Views: 298,967
Posted By Gerald D
Kim, your pinion diameter will be very...

Kim, your pinion diameter will be very big.....you will have very little force to drive the router unless you put lots of gears/belts between the motor and pinion.
Forum: Miscellaneous / General / Whatever / Catchall Thu 24 January 2008, 01:38
Replies: 308
Views: 298,967
Posted By Gerald D
Hi Kim, welcome back! See this thread: ...

Hi Kim, welcome back!

See this thread:
http://www.mechmate.com/forums/showthread.php?t=244
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