GT2 Belts: Difference between revisions
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=Sourcing= | =Sourcing= | ||
*Ebay - 15 mm belt - $1/foot at 100M quantity - [https://www.ebay.com/itm/GT2-2GT-open-Synchronous-Timing-Belt-Width-6-9-15mm-Small-Backlash-3D-Printer-/221884227725] | *Ebay - 15 mm belt - $1/foot at 100M quantity - [https://www.ebay.com/itm/GT2-2GT-open-Synchronous-Timing-Belt-Width-6-9-15mm-Small-Backlash-3D-Printer-/221884227725]. 500 lb per inch breaking strength. Operate at 10% of breaking strength? | ||
*SDP-SI has up to 9 mm belts - [http://sdp-si.com/products/timing-belts/gt2.php] | *SDP-SI has up to 9 mm belts - [http://sdp-si.com/products/timing-belts/gt2.php] | ||
*$40 for 10m of 9 mm - [http://www.ebay.com/itm/BEMONOC-GT2-2GT-Timing-Belt-Width-9mm-Rubber-Drive-Belt-for-3D-Printer-Pack-of-/112542770582?epid=2125253119&hash=item1a34126596:g:o1QAAOSw-81Zo22U] | *$40 for 10m of 9 mm - [http://www.ebay.com/itm/BEMONOC-GT2-2GT-Timing-Belt-Width-9mm-Rubber-Drive-Belt-for-3D-Printer-Pack-of-/112542770582?epid=2125253119&hash=item1a34126596:g:o1QAAOSw-81Zo22U] | ||
Revision as of 14:56, 12 March 2018
- 5 thousandths, or .12 mm - is enough to cause trouble. Depth of cut is .12mm for circuits.
- See Shapeoko discussion - [1]
- Latest Shapeoko uses GT2 9 mm
- Most RepRaps use GT2 6 mm
Calculations
- Positioning accuracy of GT2 belt - Say 1/2" pulley. Circumference about 40 mm. 200 steps per revolution = .2 mm positioning - but with 16 microstepping RAMPS standard - we get down to 0.01 mm positioning accuracy, or 0.5 thousandths. Positioning Accuracy does not stand in the way of a successful build - therefore only backlash and belt stretching need to be resolved. For belt stretching, the solution is proper tensioning. So this looks optimistic, gien a solid frame."
- Chart at [2] shows positioning accuracy of GT2 belt to be 0.0003 - about half that of the RAMPS 16 microstepping calculation above - meaning that GT2s can accept up to 1/32 microstepping.
- The question is - how much does the belt stretch upon acceleration (force)?
- Why is there no resource that states belt stretch as a function of force?
SMEs (Subject Matter Experts
- Contact Application Engineering Department - of SDP-SI - this belt bible - [3]- Tel: 516-328-3300
Sourcing
- Ebay - 15 mm belt - $1/foot at 100M quantity - [4]. 500 lb per inch breaking strength. Operate at 10% of breaking strength?
- SDP-SI has up to 9 mm belts - [5]
- $40 for 10m of 9 mm - [6]
- $32 Amazon prime for 9mm, 10m - [7]