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Forum: 702. Power Supplies Fri 26 June 2015, 13:18
Replies: 134
Views: 158,131
Posted By Gerald D
Removed Reference Post You might also be able...

Removed Reference Post
You might also be able to run even less voltage without lost steps . . . . just as you are able to get around in a small car without bumping into anyone. It proves nothing.
...
Forum: 702. Power Supplies Fri 26 June 2015, 09:23
Replies: 134
Views: 158,131
Posted By Gerald D
Removed Reference Post I would add 20% to...

Removed Reference Post

I would add 20% to voltages calculated by Mariss, which takes the 48V to 58V.

The shorter motor has much more chance of loosing steps because it has less torque....
Forum: 702. Power Supplies Thu 25 June 2015, 22:51
Replies: 134
Views: 158,131
Posted By Gerald D
Sorry Bazza, my appetite for getting involved...

Sorry Bazza, my appetite for getting involved with detail numbers in individual cases was killed long ago. :o
Forum: 702. Power Supplies Sat 10 August 2013, 06:54
Replies: 134
Views: 158,131
Posted By Gerald D
Well then Ken, the last thing you want is to feel...

Well then Ken, the last thing you want is to feel constrained by a mythical voltage limit. Go for it!
Forum: 702. Power Supplies Sat 10 August 2013, 01:36
Replies: 134
Views: 158,131
Posted By Gerald D
Correct, the manufacturers of stepper motors set...

Correct, the manufacturers of stepper motors set two absolute limits: temperature and current. And I would always stay within these limits and recommend everyone else does the same.

The motor...
Forum: 702. Power Supplies Fri 09 August 2013, 10:55
Replies: 134
Views: 158,131
Posted By Gerald D
The voltage that I am suggesting, in my...

The voltage that I am suggesting, in my experience, have the drives run cold and the motors below the manufacturer's allowed limits. No "laws of physics" are being broken. No "maximum voltages" are...
Forum: 702. Power Supplies Fri 09 August 2013, 08:21
Replies: 134
Views: 158,131
Posted By Gerald D
People who follow your advice will never...

People who follow your advice will never experience any overheating . . . but they won't experience the cutting performance that is intended from the MechMate either.

People who follow my...
Forum: 702. Power Supplies Fri 09 August 2013, 08:10
Replies: 134
Views: 158,131
Posted By Gerald D
My transformers did not fail, they were selected...

My transformers did not fail, they were selected at too low a voltage.
Forum: 702. Power Supplies Fri 09 August 2013, 00:51
Replies: 134
Views: 158,131
Posted By Gerald D
Ken, it is not practical to exactly measure the...

Ken, it is not practical to exactly measure the temperatures because there are so many variations depending on the job at hand. However, everyone in the workshop has a regular habit of laying their...
Forum: 702. Power Supplies Thu 08 August 2013, 20:57
Replies: 134
Views: 158,131
Posted By Gerald D
You have often mentioned you tested motor heating...

You have often mentioned you tested motor heating on your test bench by simulating 3-D cuts. Now it is clear that you don't actually know what happens in the real world with 3D cuts. I have now...
Forum: 702. Power Supplies Thu 08 August 2013, 11:33
Replies: 134
Views: 158,131
Posted By Gerald D
Which motor are you then referring to when you...

Which motor are you then referring to when you say:
Forum: 702. Power Supplies Thu 08 August 2013, 08:13
Replies: 134
Views: 158,131
Posted By Gerald D
Mike, we have rack&pinion Z drives and always the...

Mike, we have rack&pinion Z drives and always the Z is the coolest motor. Identical 7.2 geared motors on all axes.
Forum: 702. Power Supplies Thu 08 August 2013, 02:03
Replies: 134
Views: 158,131
Posted By Gerald D
Thanks Ken, you confirm our experience; in 3D...

Thanks Ken, you confirm our experience; in 3D cutting, the slowest moving, lightly loaded motor is the coolest.

It is surprising that you have chosen "full current when stop". Most of us opt for...
Forum: 702. Power Supplies Wed 07 August 2013, 23:15
Replies: 134
Views: 158,131
Posted By Gerald D
Ken, you do a lot of texture cutting, where your...

Ken, you do a lot of texture cutting, where your Z-motor is moving very slowly and almost continuously . . . . . . . does that motor get much hotter than the X or Y motors? Our experience is that the...
Forum: 702. Power Supplies Wed 07 August 2013, 00:41
Replies: 134
Views: 158,131
Posted By Gerald D
The 86HS9801 motor has Rated Current (A) = 4.0...

The 86HS9801 motor has Rated Current (A) = 4.0 and Phase Resistance (Ohms)= 0.98. The voltage marked on the motor would thus be 4.0 x 0.98 = 3.92 Volt.

Most websites and producers (other than...
Forum: 702. Power Supplies Tue 06 August 2013, 09:38
Replies: 134
Views: 158,131
Posted By Gerald D
The plus 20% comes from my personal experience -...

The plus 20% comes from my personal experience - We have increased the voltage of our 4 tables to about 20% over the conservative Mariss formula value, to give really good cutting performance. If...
Forum: 702. Power Supplies Mon 07 May 2012, 23:21
Replies: 134
Views: 158,131
Posted By Gerald D
1000VA transformers need a big inrush current...

1000VA transformers need a big inrush current when they switch on. This gives problems to quite a few people.
Forum: 702. Power Supplies Wed 11 February 2009, 07:04
Replies: 134
Views: 158,131
Posted By Gerald D
That was a 1 500 VA supply that caused Irfan his...

That was a 1 500 VA supply that caused Irfan his troubles.
Forum: 702. Power Supplies Wed 11 February 2009, 06:27
Replies: 134
Views: 158,131
Posted By Gerald D
Your thinking is correct. The 500VA will do the...

Your thinking is correct. The 500VA will do the job. (I am also fairly confident that the 300VA will do okay on the G540). The only downside of bigger VA (aside from cost & size) is the inrush...
Forum: 702. Power Supplies Wed 08 October 2008, 13:23
Replies: 134
Views: 158,131
Posted By Gerald D
Thanks for the spreadsheet Mike. I am still...

Thanks for the spreadsheet Mike. I am still entirely comfortable in de-rating the transformer VA size by a third. See this thread (http://www.mechmate.com/forums/showthread.php?t=828), and my...
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