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Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 19 August 2010, 05:04
Replies: 449
Views: 475,523
Posted By Gerald D
You could drill two holes, wide apart, through a...

You could drill two holes, wide apart, through a batten, into your spoil board. Then try and dowel the batten to the spoilboard in different directions, looking for the error on the dowel holes.
...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 18 August 2010, 22:13
Replies: 449
Views: 475,523
Posted By Gerald D
Alan, if your racks fitted into each other (teeth...

Alan, if your racks fitted into each other (teeth meshed) along their whole length (before fitting to MM), then the "steps Per" must be identical.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 18 August 2010, 09:28
Replies: 449
Views: 475,523
Posted By Gerald D
I last bought Tufnol from:...

I last bought Tufnol from: http://www.windingwires.co.za/distribution_network.html
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sat 06 March 2010, 09:06
Replies: 449
Views: 475,523
Posted By Gerald D
Ron, when Dave said: I was fairly...

Ron, when Dave said:



I was fairly sure he was talking pilot bore in that case....they can go much bigger.

For the small pinior gear, some of us have added a ring around the collar to...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 05 March 2010, 23:24
Replies: 449
Views: 475,523
Posted By Gerald D
Dave, the small bore given by pulley/gear...

Dave, the small bore given by pulley/gear suppliers is meant as a "pilot" bore....which means you are expected to increase the bore to suit your application. Very often they are supplied with no hole...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 05 March 2010, 12:29
Replies: 449
Views: 475,523
Posted By Gerald D
We are having issues with keeping the pinion...

We are having issues with keeping the pinion gears fastened to 1/2" shafts - you should expect lots of problems if you go smaller than 1/2"
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 03 March 2010, 20:19
Replies: 449
Views: 475,523
Posted By Gerald D
Dave, if I ever got to building belt drives, I...

Dave, if I ever got to building belt drives, I would also increase the space between the pulleys a little to get more teeth in contact for the small pulley. Your layout looks good.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 31 January 2010, 10:08
Replies: 449
Views: 475,523
Posted By Gerald D
Ah, now I understand where you want to go . . . ...

Ah, now I understand where you want to go . . .

Yes, a module 1 will give you a finer (smoother) drive than module 1.5. So, why doesn't everyone always use module 1 for everything? Some high...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 31 January 2010, 07:25
Replies: 449
Views: 475,523
Posted By Gerald D
David if your present geared drives are giving...

David if your present geared drives are giving backlash problems (and if it is definitely backlash), then a belt drive will give an improvement. But, if you are getting rough cuts for unknown...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sat 30 January 2010, 22:41
Replies: 449
Views: 475,523
Posted By Gerald D
For those small washers, I would use "fiber" or...

For those small washers, I would use "fiber" or "sealing" washers, the reddish ones you typically find on an oil drain plug on your car/bike/lawnmower/plumbing.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 29 January 2010, 23:41
Replies: 449
Views: 475,523
Posted By Gerald D
Correct Ros, and the first step is to centralize...

Correct Ros, and the first step is to centralize them, as was done in this thread. (we had one versus the rest before).

Matt, the laser cut version shown...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 29 January 2010, 21:30
Replies: 449
Views: 475,523
Posted By Gerald D
Matt, there is nothing special or unique about...

Matt, there is nothing special or unique about Chopper's 4:1 drive that made it any better than any other drive in this thread. In fact, it has the poorest angle of wrap on the small pulley and some...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 21 January 2010, 22:33
Replies: 449
Views: 475,523
Posted By Gerald D
The above posts, and reply, copied to: ...

The above posts, and reply, copied to:
"Grub"/set scews for pinion gears, with LocTite ? (http://www.mechmate.com/forums/showthread.php?t=795)
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 20 January 2010, 08:15
Replies: 449
Views: 475,523
Posted By Gerald D
I have copied the posts regarding excessive...

I have copied the posts regarding excessive backlash in the OM geared motors to Backlash in the gearhead of the Oriental Motor PK296A2A-SG7.2 (http://www.mechmate.com/forums/showthread.php?t=887)
...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 19 January 2010, 20:19
Replies: 449
Views: 475,523
Posted By Gerald D
We have found that the most common source of...

We have found that the most common source of "backlash" seen in the x and y direction is caused by a loose z-slide. The z-slide roller eccentrics should be adjusted up to hold a pre-load on the...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 19 January 2010, 12:19
Replies: 449
Views: 475,523
Posted By Gerald D
You talk of very high accel values in your case,...

You talk of very high accel values in your case, but I don't believe they can be very high because the stepper motor would lose steps (slip). Your torque/force/impact limit is set by the stepper...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 19 January 2010, 09:26
Replies: 449
Views: 475,523
Posted By Gerald D
Chopper got out of hand (link...

Chopper got out of hand (link (http://www.mechmate.com/forums/showthread.php?t=2438)) and he is no longer allowed to post here.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 14 October 2009, 04:36
Replies: 449
Views: 475,523
Posted By Gerald D
Thanks, the post above has been edited.

Thanks, the post above has been edited.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 13 October 2009, 00:08
Replies: 449
Views: 475,523
Posted By Gerald D
Relax a bit Chopper. Nobody is saying that you...

Relax a bit Chopper. Nobody is saying that you have built a bad drive, and nobody is saying that the backlash in a geared motor can be ignored.

I do not understand how these marks. . . .
...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 12 October 2009, 09:35
Replies: 449
Views: 475,523
Posted By Gerald D
A chart which says to limit XL to 180 oz.in...

A chart which says to limit XL to 180 oz.in torque:
http://www.torquetrans.com/pulleys/timing-pulleys/images/xl-l-timing-belt-pulleys.pdf
...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 11 October 2009, 23:03
Replies: 449
Views: 475,523
Posted By Gerald D
Chopper, for belt drives, the engineers publish...

Chopper, for belt drives, the engineers publish charts like this:

6645

The bottom left corner of the chart starts at 0.1kw (100 Watts) and 100rpm., which would be quite a common situation for...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 11 October 2009, 11:50
Replies: 449
Views: 475,523
Posted By Gerald D
There is a serious misunderstanding of the amount...

There is a serious misunderstanding of the amount of torque available from a "OM 7.2" motor/gearbox package. It gives a lot more than 700-750 ozin, but the spec says that you must not design your...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 11 October 2009, 02:10
Replies: 449
Views: 475,523
Posted By Gerald D
. . . . and the type of cutting that you want to...

. . . . and the type of cutting that you want to do, and the jog speed you want to achieve while not cutting.

On the cutting, working in soft woods is different to working in hardwoods.

The...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sat 10 October 2009, 23:27
Replies: 449
Views: 475,523
Posted By Gerald D
Chopper, the oriental 7.2 behaves like a...

Chopper, the oriental 7.2 behaves like a belt-drive at 7.2 ratio. For a discussion on the best ratio, there is no need to bring in a discussion of gear vs. belt.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 05 October 2009, 11:53
Replies: 449
Views: 475,523
Posted By Gerald D
It is all a compromise . . . 3-1 is...

It is all a compromise . . .

3-1 is practical minimum for simplicity, low mass, low space needed, low cost, high reliability, high tolerance of flying dust, and still a significant improvement...
Showing results 1 to 25 of 52
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