|
|
|
![]() |
|
|||||||
|
||||||||
![]() |
|
|
Thread Tools | Rate Thread | Display Modes |
|
|
|
#1
|
||||
|
||||
|
Re: Polycord and polycord pullies
Quote:
See Art Dutra's method from 2009 that has always served me well.* That was just a few years ago, right? ![]() *Don't do 10% shorter. 3-5% is sufficient and much easier. Last edited by Ian Curtis : 26-01-2017 at 00:03. |
|
#2
|
||||
|
||||
|
Re: Polycord and polycord pullies
We use hex shaft and cut the disks for the poly cord out of 1/8 polycarbonate. We cut them on the waterjet but you could probably find a different way to cut them and then use a hex broach for the hole. (These are for driven pulleys or idler pulleys on a live axle) We are presently using 3 - 1/8 inch center pieces and two 1/8 inch outer pieces with a difference of 3/16 so that the round drive belt is 1/16 proud. This gives us a 3/8 spacing in the middle of the pulley with the two side plates....
Are you using a dead axle for them or a live axle? idlers can just spin on a dead round axle (with or without bearings if you use something slippery like UHMW for the pulleys.... ) In the past we have also used a piece of PVC pipe and glued on more PVC pipe cut from connectors as spacers between the belts. We put a hub inside the pipe on both ends and ran an axle through it. This worked OK but was not optimal although it was pretty cheap to make. The belts all drive together but you will have to put a sprocket on one of them connected to the motor (with chain) to put power to the whole assembly. |
|
#3
|
||||
|
||||
|
Re: Polycord and polycord pullies
Quote:
|
|
#4
|
||||
|
||||
|
Re: Polycord and polycord pullies
if you have access to a lathe nothing beats solid delrin for polycord. they work great with dead and live axles. delrin lubricates itself. if you need to drive it its also super easy to hex broach. machine it to the desired diameter then notch it for the poly cord to ride in.
|
|
#5
|
|||
|
|||
|
Re: Polycord and polycord pullies
4063 3D prints all of our polycord pullies.
|
|
#6
|
|||||
|
|||||
|
Re: Polycord and polycord pullies
Quote:
|
![]() |
| Thread Tools | |
| Display Modes | Rate This Thread |
|
|