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Search: Posts Made By: Gerald D
Forum: MechMates already cutting Sun 12 October 2014, 01:15
Replies: 984
Views: 680,601
Posted By Gerald D
What is a super spacer?

What is a super spacer?
Forum: MechMates already cutting Fri 29 March 2013, 10:43
Replies: 984
Views: 680,601
Posted By Gerald D
I spent a month in a snowed part of Germany once....

I spent a month in a snowed part of Germany once. At first it was beautiful but then I felt that it dulled my senses; No colour, no differences in touch (with gloves), no smells. They put people in...
Forum: MechMates already cutting Fri 29 March 2013, 00:06
Replies: 984
Views: 680,601
Posted By Gerald D
These scenes...

These scenes...
Forum: MechMates already cutting Tue 26 March 2013, 00:02
Replies: 984
Views: 680,601
Posted By Gerald D
The following deserves a thread on its own, but I...

The following deserves a thread on its own, but I havn't the patience to start it....

The likable Mike R actually did major damage to the concept of using steppers for CNC routing. If you...
Forum: MechMates already cutting Mon 25 March 2013, 09:25
Replies: 984
Views: 680,601
Posted By Gerald D
Here is a scenario, probably not applicable to...

Here is a scenario, probably not applicable to you, that shows how the reality and the theory can be two different things . . . . and needing the theory to to be expanded:

An acceleration of the...
Forum: MechMates already cutting Sun 24 March 2013, 07:40
Replies: 984
Views: 680,601
Posted By Gerald D
Sorry Pete, I have stopped hurting my head with...

Sorry Pete, I have stopped hurting my head with detailed scenarios like this.
Forum: MechMates already cutting Sun 24 March 2013, 05:20
Replies: 984
Views: 680,601
Posted By Gerald D
Pete, you are paying the price for following...

Pete, you are paying the price for following Mike's ultra conservative advice on stepper motor voltages. Now you are wasting hours trying to squeeze a little more torque out before you loose steps by...
Forum: MechMates already cutting Thu 21 March 2013, 03:36
Replies: 984
Views: 680,601
Posted By Gerald D
In general, if the motor runs cool, push the...

In general, if the motor runs cool, push the voltage up (limited by what the drive will handle). Yes, that does need a different transformer, but it is well worth it to get the higher performance.
Forum: MechMates already cutting Fri 23 November 2012, 08:48
Replies: 984
Views: 680,601
Posted By Gerald D
I was thinking the opposite :confused:

I was thinking the opposite :confused:
Forum: MechMates already cutting Thu 22 November 2012, 22:32
Replies: 984
Views: 680,601
Posted By Gerald D
13630 There is no ghosting in the...

13630


There is no ghosting in the yellow areas?

Does the change in the picture on the red lines mean anything? (This is what I first thought the picture was all about)

The dragon casts...
Forum: MechMates already cutting Thu 22 November 2012, 11:53
Replies: 984
Views: 680,601
Posted By Gerald D
Are you seeing ghost lines/images to the left...

Are you seeing ghost lines/images to the left side only? What is your cut direction?
Forum: MechMates already cutting Thu 22 November 2012, 10:11
Replies: 984
Views: 680,601
Posted By Gerald D
Pete, I am afraid that the photo doesn't help me...

Pete, I am afraid that the photo doesn't help me understand what you are trying to explain. :confused:
Forum: MechMates already cutting Sun 21 October 2012, 23:49
Replies: 984
Views: 680,601
Posted By Gerald D
Just skimming the above discussion, I think...

Just skimming the above discussion, I think detection of loss of coolant flow is quite valid, but it shouldn't trigger a stop....it should just give an early warning, by audible alarm or flashing...
Forum: MechMates already cutting Sun 14 October 2012, 10:20
Replies: 984
Views: 680,601
Posted By Gerald D
- tension the z-slide rollers with the eccentrics

- tension the z-slide rollers with the eccentrics
Forum: MechMates already cutting Fri 12 October 2012, 00:35
Replies: 984
Views: 680,601
Posted By Gerald D
Uneven spacing, when direction is reversed,...

Uneven spacing, when direction is reversed, points to mechanical flex or slack.
Forum: MechMates already cutting Wed 25 April 2012, 23:12
Replies: 984
Views: 680,601
Posted By Gerald D
Bend up at the red line 13226

Bend up at the red line

13226
Forum: MechMates already cutting Tue 24 April 2012, 23:12
Replies: 984
Views: 680,601
Posted By Gerald D
Do you understand what I meant by "creased to tip...

Do you understand what I meant by "creased to tip its nose up at an angle"?
Forum: MechMates already cutting Tue 24 April 2012, 09:55
Replies: 984
Views: 680,601
Posted By Gerald D
You don't want 315 to be mounted too low on the...

You don't want 315 to be mounted too low on the gantry because it will protrude too much into your workspace under your gantry.

325 can simply be creased to tip its nose up at an angle, and that...
Forum: MechMates already cutting Fri 06 April 2012, 01:09
Replies: 984
Views: 680,601
Posted By Gerald D
Sorry Pete, I've gotten myself too deep into the...

Sorry Pete, I've gotten myself too deep into the minutae here, but I did give you the basic things to watch out for.

This should be full scale: 13207
Forum: MechMates already cutting Thu 05 April 2012, 05:32
Replies: 984
Views: 680,601
Posted By Gerald D
If your tubes are short, your wiggle room between...

If your tubes are short, your wiggle room between the gantry and the rails is limited. If the tubes are long, the pinion gear need to overhang the motor shaft a lot to reach the rack. Don't forget...
Forum: MechMates already cutting Thu 05 April 2012, 05:27
Replies: 984
Views: 680,601
Posted By Gerald D
Pete, I hadn't fully read this thread, and...

Pete, I hadn't fully read this thread, and assumed your rails were angle iron stock with cut and ground tips. Now it seems you have those ready made rails for bolting to the angle iron. If the latter...
Forum: MechMates already cutting Thu 05 April 2012, 05:05
Replies: 984
Views: 680,601
Posted By Gerald D
Subtract the thickness of part 1020452 from that...

Subtract the thickness of part 1020452 from that 8.5, and that leaves you less than 2.5mm to build up with shim washers.

The 2.5mm is an allowance for welding the gantry slightly out of square ....
Forum: MechMates already cutting Wed 04 April 2012, 23:28
Replies: 984
Views: 680,601
Posted By Gerald D
Pete From old drawings, tube length is...

Pete

From old drawings, tube length is distance between centers of rollers plus 33mm. Let us know if your research turns up anything much different.
Forum: MechMates already cutting Thu 03 November 2011, 23:49
Replies: 984
Views: 680,601
Posted By Gerald D
Pete, your logic is sound. In the old...

Pete, your logic is sound.

In the old magnet type steppers (aluminum/nickel/cobalt "alnico (http://www.magnetsales.com/Alnico/Al1.htm)") the motors were magnetized after assemby, and could be...
Forum: MechMates already cutting Tue 01 November 2011, 23:51
Replies: 984
Views: 680,601
Posted By Gerald D
Old type magnets are potentially ruined when...

Old type magnets are potentially ruined when opening. I have replaced failed bearings in a modern stepper without apparent loss of torque.
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