2:1 Nylon Gear Reduction, Maintaining Belt Path
by Taulman, published
A second requirement was to maintain the belt path. To accomplish this, two idlers are used.
The Belt System for the 2BEIGH3 is the XL 3/8" .200" style.
Operation is best demonstrated in a video:
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Yes, I noticed the belt after I took the video, but you can see it's simply clamped to a table and I just used a large plastic tube on the other end of the belt, so it's not tight.Â I really wanted to show that the center idler rotates opposite of the drive gear. Any 3mm hotend will do.Â I've had testers use all kinds from J-Heads to Budas..etcÂ to stock.Â These printed at bout 238c or so.
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The belt drive 8 T XL comes from thingiverse.com/thing:16627
The XL drives are a bit long, so you can cut to a needed length.
2-3 perimeters depending on your current nozzle size.
3 solid surfaces
For holes, we use "inch" sizes just over or just under the required metric size. This gives a tight friction fit of the drive gear, as well as just enough clearance on the idlers.
The lengths of bolts required depend on your stepper mounting flange thickness.
You'll need to update your steps/mm in software or the part will be 50% of design DIM.
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