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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 08 March 2010, 10:38
Replies: 36
Views: 51,883
Posted By Gerald D
The 12kg spring load gives about 20kg load at the...

The 12kg spring load gives about 20kg load at the pinion due to the leverage effect. This has been found to be enough force to prevent the pinion gear from climbing out of the rack - the motor will...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 22 February 2010, 07:58
Replies: 36
Views: 51,883
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 Mon 29 December 2008, 06:12
Replies: 36
Views: 51,883
Posted By Gerald D
1) It is steel. You can put plastic under it if...

1) It is steel. You can put plastic under it if you want.

2.1) y' axis has no meaning.
2.2) & 2.3) Use your CAD program to open the .dxf files - there you can measure all exactly.

Enough of...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 28 December 2008, 09:48
Replies: 36
Views: 51,883
Posted By Gerald D
1.) The rack is not perfectly parallel to the...

1.) The rack is not perfectly parallel to the rail. As the car moves along the rail & rack the pinion must move up and down a little bit. The motor slides inside the plastic for this small movement....
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 28 December 2008, 09:05
Replies: 36
Views: 51,883
Posted By Gerald D
Point A is the rotation center. The slot at...

Point A is the rotation center.

The slot at B is an arc with the center at A

At A and B, the screws are tightened against plastic washers - the motor plate is inside the sandwich of plastic...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 22 December 2008, 08:30
Replies: 36
Views: 51,883
Posted By Gerald D
Selecting motors for the MechMate ...

Selecting motors for the MechMate (http://www.mechmate.com/forums/showthread.php?t=1114)
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 22 December 2008, 06:20
Replies: 36
Views: 51,883
Posted By Gerald D
The motors' detent torque keeps them in sync...

The motors' detent torque keeps them in sync while the motors are shut down. We don't normally zero the machine at startup, unless we suspect that someone has bumped it out of square.
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Sun 21 December 2008, 23:07
Replies: 36
Views: 51,883
Posted By Gerald D
Ton, the samson machine has a very light gantry...

Ton, the samson machine has a very light gantry and is only use for plasma where there is zero cutting force. On the MechMate we have very high sideways cutting forces and therefore also a much...
Forum: Driving Mechanisms: Rack/pinion, gears, screws, belts & chains Mon 03 November 2008, 10:49
Replies: 36
Views: 51,883
Posted By Gerald D
All 4 axes use a similar method. The motor swings...

All 4 axes use a similar method. The motor swings against the rack and is held by spring force to eliminate backlash. See some build pictures:
...
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