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Search took 0.00 seconds. Search: Posts Made By: Gerald D
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 04 April 2011, 04:46
Replies: 96
Views: 118,858
Posted By Gerald D
Have got 5 tables running with 3 different...

Have got 5 tables running with 3 different motor/gearbox combinations and 2 different rack suppliers/pitches. ALL of them were set to the calc and needed no tweaking afterwards.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 10 November 2010, 23:09
Replies: 96
Views: 118,858
Posted By Gerald D
Then 82.144 is correct. Are you sure that you...

Then 82.144 is correct. Are you sure that you didn't type in 87.144? :)
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 10 November 2010, 22:50
Replies: 96
Views: 118,858
Posted By Gerald D
Also count the number of rack teeth over 100mm to...

Also count the number of rack teeth over 100mm to verify that it is Mod1. (a quick mental calc says 32 teeth?)
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 10 November 2010, 22:41
Replies: 96
Views: 118,858
Posted By Gerald D
What drives are you using for the motors, and...

What drives are you using for the motors, and what are they set to for micro-stepping? (The geckodrive is fixed at 10 micro-steps).

The 5:1 gearbox 1600 pulses has me scratching my head....
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 21 October 2009, 04:02
Replies: 96
Views: 118,858
Posted By Gerald D
I don't know where you see: "the max rot of the...

I don't know where you see: "the max rot of the OM of 250rpm"?

Maybe the output shaft max speed is 250rpm while the actual motor turns 7.2 times faster?

If the output shaft can turn at...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 22 February 2009, 12:23
Replies: 96
Views: 118,858
Posted By Gerald D
If you have direct drive motors, 24 tooth pinions...

If you have direct drive motors, 24 tooth pinions and DP20 (non-metric) pitch, then your setting should be 20.886 steps per mm.

(I don't know where you got the pitch diameter of 32.76? That...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 04 January 2009, 04:10
Replies: 96
Views: 118,858
Posted By Gerald D
Sean Reish is using 7.2 ratio and 20 teeth. Doc...

Sean Reish is using 7.2 ratio and 20 teeth. Doc Tanner & Greg J are using 3.6 ratio and 30 teeth. Lots of people use 7.2 and 30 teeth. Nobody has cut quality problems. Greg J would like a bit more...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 04 January 2009, 02:29
Replies: 96
Views: 118,858
Posted By Gerald D
30 teeth rolls smoother than 20 teeth 30 teeth...

30 teeth rolls smoother than 20 teeth
30 teeth has less wear than 20 teeth
30 teeth on a 3.6 gearbox has low torque.
20 teeth on a 7.2 gearbox needs very high step pulse frequency.

But, that...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 12 December 2008, 06:07
Replies: 96
Views: 118,858
Posted By Gerald D
See...

See http://www.mechmate.com/forums/showthread.php?p=14773&postcount=14
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 12 December 2008, 06:06
Replies: 96
Views: 118,858
Posted By Gerald D
For module 1.5 you can go for the 24 tooth. (keep...

For module 1.5 you can go for the 24 tooth. (keep the C dimension at about 36mm)
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Fri 12 December 2008, 04:00
Replies: 96
Views: 118,858
Posted By Gerald D
Those are metric module 1 gears. The 36 tooth is...

Those are metric module 1 gears. The 36 tooth is the popular choice for metric gears.

But, the E dimension of 10mm looks too narrow. We work with 15mm. Our rack is 15mm wide.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sat 09 August 2008, 09:39
Replies: 96
Views: 118,858
Posted By Gerald D
If you told Mach that you are using mm, then it...

If you told Mach that you are using mm, then it will use mm.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 12 June 2008, 10:12
Replies: 96
Views: 118,858
Posted By Gerald D
Have to emphasise this again. When folk...

Have to emphasise this again.

When folk here casually talk of 20 or 30 tooth pinions, they are probably working in inches. The metric people will probably be talking 24 or 36 tooth.

The...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 12 June 2008, 00:16
Replies: 96
Views: 118,858
Posted By Gerald D
Mark, your result is close enough (checking...

Mark, your result is close enough (checking against the spreadsheet).
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 24 April 2008, 07:54
Replies: 96
Views: 118,858
Posted By Gerald D
See drawing M2 10 110 W

See drawing M2 10 110 W
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Wed 02 April 2008, 00:07
Replies: 96
Views: 118,858
Posted By Gerald D
The calculator in post #27 above has been...

The calculator in post #27 above has been expanded to include speeds and frequencies
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Thu 24 January 2008, 20:06
Replies: 96
Views: 118,858
Posted By Gerald D
Typical: 1. if I chose PK299-01AA motors I...

Typical:

1. if I chose PK299-01AA motors I should use it directly (no reduction). If no reduction, What gear should I use? 30 or 35 teeth 20 DP in all 4 motors? 20 teeth 20 DP

2 if I chose...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Tue 24 July 2007, 23:54
Replies: 96
Views: 118,858
Posted By Gerald D
Now that everyone understands how to calculate...

Now that everyone understands how to calculate these things . . . .

1139

. . . . and the zipped spreadsheet where you can play with your own values in the green area: 1140
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 23 July 2007, 23:27
Replies: 96
Views: 118,858
Posted By Gerald D
Hi Mickey, I presume you are going to use metric...

Hi Mickey, I presume you are going to use metric Module 1 gears. If this is the case, then I suggest a 35 tooth pinion to go with the 7.2:1 gearbox.

*** The following added at top of thread as...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 28 May 2007, 21:01
Replies: 96
Views: 118,858
Posted By Gerald D
It is near the middle of the tooth. I used...

It is near the middle of the tooth.

I used the words effective diameter, but the guys who work with gears all day call it the Pitch Diameter, or the diameter of the Pitch Circle.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 20 May 2007, 12:24
Replies: 96
Views: 118,858
Posted By Gerald D
The popular choice of DP20(1/2"Wide) pinion for...

The popular choice of DP20(1/2"Wide) pinion for the motors with 7.2:1 gearbox now seems to be the 30tooth. Doc Tanner, and all the latest ShopBots, are going with that choice. (for the 3.6:1 gearbox,...
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