Drive belt Questions ? I received the drive belt from the RRRF; I though it was odd as all the pictures show white belt this belt is black. So before making the gears using CAPA, as described by Joost van de Wiel in his post July 03, 2007 06:47AM. I did a few calculations based on the XML Belt that seems to have 2.032 pitch not 2.5mm pitch thus:- 50-(0.64 * 2) * 3.14159265/ 2.032 = 75.32 (75) teeth. 14-(0.64 * 2) * 3.14159265 / 2.032 = 19.65 (20) teeth. The original post by Joost did not indicate which belt was used. Questions Has any one else used the RRRF belt? What was the diameter / number of teeth for each gear used? If as above how can the difference of 0.468 mm per tooth be compensated for? Was the belt originaly 2.032mm pitch with a recent design change to 2.5mm pitch? Many thanks https://reprap.org/forum/read.php?14,19984,19984#msg-19984 Mon, 20 Jul 2026 06:29:53 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?14,19984,19985#msg-19985 Re: Drive belt Questions ? https://reprap.org/forum/read.php?14,19984,19985#msg-19985
Calculations based on 2.5mm pitch
NB the 0.64mm is the depth of belt before the teeth.

50-(0.64 * 2) * 3.14159265/ 2.032 = 61.22 (61) teeth.

14-(0.64 * 2) * 3.14159265 / 2.032 = 15.98 (16) teeth.

Thus one turn is 16 * 2.5mm 40mm the same as 20 teeth at 40mm / 2.032

Back to making CAPA / Polymorph moulds doh... :o]]> BodgeIt Mechanics Sat, 03 Jan 2009 11:26:29 -0500 https://reprap.org/forum/read.php?14,19984,19984#msg-19984 Drive belt Questions ? https://reprap.org/forum/read.php?14,19984,19984#msg-19984
I did a few calculations based on the XML Belt that seems to have 2.032 pitch not 2.5mm pitch thus:-

50-(0.64 * 2) * 3.14159265/ 2.032 = 75.32 (75) teeth.

14-(0.64 * 2) * 3.14159265 / 2.032 = 19.65 (20) teeth.

The original post by Joost did not indicate which belt was used.

Questions

Has any one else used the RRRF belt?
What was the diameter / number of teeth for each gear used?
If as above how can the difference of 0.468 mm per tooth be compensated for?
Was the belt originaly 2.032mm pitch with a recent design change to 2.5mm pitch?

Many thanks]]> BodgeIt Mechanics Sat, 03 Jan 2009 10:49:20 -0500