SoliForum - 3D Printing Community — Beltless Drive X-Y Axis (Level 2 - Techie)

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2015-04-07T13:10:24Z

I ll try this later on my second machine. I wish there was a video or guide with pics but what i read on these 5 pages should do the trick.
Thanks guys

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-20T19:55:23Z

As long as the y-belts are tight and cant move that is all that matters.
The drive belt has to stay... There is no way that I am aware of to do that one.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-20T19:50:09Z

I don't think I need to screw holes. The SD4 carriage uses a press design wich presses the belt between a 3d printed part with teeth and the top part of the carriage. I can just remove that 3d printed part and tighten the lines under the screw (can add a washer).

Now, can I also replace the short Y motor belt rod with fiishing line? How?

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-20T04:56:57Z

n2ri wrote:

yeah its like navy Capstan post winches for hundreds of years. and thats why the navy winches are shaped that way also. so pulleys may work better if shaped the same

Not sure I followed that could you post a picture?

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-20T00:03:59Z

yeah its like navy Capstan post winches for hundreds of years. and thats why the navy winches are shaped that way also. so pulleys may work better if shaped the same

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-19T21:42:21Z

I have not had any noticeable wear on the pulleys and yes the line does float side to side on the pulleys a little bit.
If you are going to use the existing carriage you will have to figure a way to attach the line to the carriage on each side. Maybe you could drill a hole in the carriage somewhere and put a bolt through it or a screw into it. I just don't know without having one it front of me but I would guess there is a way.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-19T21:31:54Z

Yeah, I tried today by replacing the left y belt. 4 loops are enough to move the pulleys.
Tried on Solidoodle 4's carriage. Will post a photo of how I did it.

Two questions:
1) Will the fishing lines wear off or somehow damage the nylon pulley teeth if used for a long period of time?
2) How do I replace the closed loop Y motor belt with fishing lines as well?

Right now the lines on the pulleys move left and right together as the carriage is moved back and fort.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-17T23:50:19Z

Yep that simple but it needs to be tight.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-17T22:58:37Z

Oh, that simple? Sounds weird that it won't slip, but I'll try it. Thanks.

( 3 "full" wraps, right? )

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-17T22:36:25Z

Oh, 3 wraps around the drive pulley and it won't slip

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-17T22:17:52Z

Solidoodle 4 also has bolts on the carriages which could be used. There is one on the top of both sides of the carriage and sandwiches the continuous belt between two 3d printed parts.

But my question was not how to tighten the fishing lines to the carriage, but how to tighten them on the pulleys.
Seems like they will just slide if not secured on the pulleys somehow.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-17T15:51:24Z

redbarret wrote:

How do you tighten the fishing line to the default pulleys?

Fishing line has been typically used with Lawsy's carriages and those had bolts that were used for the adjustment right on the carriage. Just tie the line to the bolt head and tighten. If you have an SD4 and want to use the existing carriages you will have to get creative as to how to attach the line to the carriage. Then just use the front idler adjustments to tighten the line.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-11-17T12:01:54Z

How do you tighten the fishing line to the default pulleys?

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-06-27T15:11:12Z

d of spectra might be thinner than what you measure freestanding, because on the pulley it's quite tight and a bit compressed (since it wraps around the pulley). It might not make a difference. I'm going to go measure it to see if I can get anything meaningful. Unfortunately I don't have a micrometer, just calipers.

Re: Beltless Drive X-Y Axis (Level 2 - Techie)

2014-06-27T07:07:59Z

Measure the diameter of the pulley teeth (tooth-tooth), call that D.
Measure the diameter of the spectra line, call that d.
Assuming you have a 1.8 degree stepper on a 16x microstep driver, steps per mm should be about 3200/(Pi*(d+D)) I think. If you get close to the value you're calibrating right now, then you've done well (and I've got my maths right...).