View Full Version : Actual value for timingbelt tesion.....
Voicecoil
22-12-2018, 11:31 PM
I'm familiar with checking the tension by prodding or twisting the belt, but does anyone have a proper figure in Newtons as to what it should typically be please? (for 10mm or 16mm AT5 belt on 24 ish tooth pulleys). I need to calculate springs for an auto-tensioner, and also want to make sure I don't exceed radial load limits on the bearings. Thanks
magicniner
22-12-2018, 11:32 PM
Manufacturer's data sheets should give this data.
The most accurate method for timing belt tension is resonance, followed by deflection.
I'm pretty sure the Gates belt calc gives tension figures, but I've not used it for a couple of years.
Voicecoil
23-12-2018, 08:35 PM
So I went and googled, and eventually found a data sheet with some maths in it and the recommended figures for pre-tension are suprisingly high, something like 1/3 to 1/2 of the full running tension for a 2 pulley system, more if you have multiple pulleys. This means that for a 4Nm Nema24 stepper and 27 tooth AT5 pulleys (which are quite big) you're looking in the region of 60...90N, which is more of a radial force than some steppers of that size will be happy with: and with smaller pulleys things would be worse.
Robin Hewitt
24-12-2018, 02:37 AM
With CNC precision I don't bother with tension, I simply put the wheels to the correct separation and it just works. If using a belt for linear positioning then you should know what tension you require and make sure you have enough teeth engaged to carry it.
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