Mini lathe as a 4th Axis

[Boyan Silyavski]

You could use the belt calculator web for finding the right belt https://www.bbman.com/belt-length-calculator/ , i asume you know of it, but anyway here is the link.

it seems that 17-18T is better choice as it has 6 teeth in mesh, versus 7 teeth for 20t, so you lose almost nothing. 6 teeth is the minimum recommended for HTD 5 belts, so you are ok there.


so 17x7=119t, which is better as its a whole number of ratio . Its not bad 1:7 ratio . Its 180mm diameter puley, the big one

I can generate you the pulley profile if you need. Thingverse also there is a pulley generator.

[Leadhead]

Boyan - Have you printed pulleys? I had not considered that option until you mentioned Thingverse. - Could print a 180mm dia. quite nicely in ABS. Got to be a cheap option if it would be serviceable? Thank you for the idea.

[magicniner]

You can increase the number of "Teeth in Contact" to at least 50% of the count on the driving pulley by using idler pulleys to generate a serpentine belt path as is done in the automotive industry,

- Nick

[Leadhead]

Nick - Yes adding a flat side idler would be quite simple. Thanks.

Boyan - Ref. Thingiverse. Did you reference "Customizable Gear4"?

[Leadhead]

Would you recommend any particular tooth form or pitch please?

[Leadhead]

Sorry missed that on your reply Boyan. HT5.

[Boyan Silyavski]

I have printed with great result.Small as GT2. I will advice PETG pulley. PLA will work also. ABS not. Nylon, even better.

HDT5 15mm will work great

https://www.thingiverse.com/thing:16627

[Leadhead]

Boyan - thanks for your advice. Do you reinforce the the pulley centre, as I will try first with PLA and wondered if it would take the torque from the shaft?

[Leadhead]

Boyan - Thingiverse/ OPENscad 2x Pully files just now easily and quickly completed. Excellent resource.