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Springs

Posted by dslc 
Springs
August 01, 2012 09:44AM
Springs for extruder idlers - anyone make their own?

I recently switched to Greg's Wade reloaded extruder (i.e. Jonas' version). It uses M4 rather than M3 screws for the idler - hence I need different springs. I haven't found springs of appropriate diameter and spring constant from the usual suppliers though (e.g. Radionics, Farnell) - or maybe I just amn't using the right search terms.

I came across one or two people mentioning that they made their own springs - from "music wire" if I recall correctly. Does anyone know where to source this?

Any suggestions?
Re: Springs
August 01, 2012 10:59AM
mcmaster.com

9434K164


- akhlut

Just remember - Iterate, Iterate, Iterate!

[myhomelessmind.blogspot.com]
Re: Springs
August 01, 2012 03:20PM
Thanks. Unfortunately McMaster only accept credit cards, however.

Looking at the Radionics catalogue again, I found this: [radionics.rs-online.com] . It has OD 9mm, ID 8mm, and a load of 33 N at minimum length. Would this be too wide for an M4 screw, or could it work?

Previously I had thought it is good to have the inner diameter of the spring just marginally larger than the diameter of the screw, but this is hardly essentiall, is it? (I mean, as long as the washer prevents the spring from popping over the screw head, that is.)

Edited 1 time(s). Last edit at 08/01/2012 03:30PM by dslc.
Re: Springs
August 01, 2012 03:31PM
dslc Wrote:
-------------------------------------------------------
> Previously I had thought it is good to have the
> inner diameter of the spring just marginally
> larger than the diameter of the screw, but this is
> hardly essentiall, is it? (I mean, as long as the
> washer prevents the spring from popping over the
> screw head, that is.)

As long as you have big enough washers, and you don't have interference problems between the two side-by-side springs, then the diameter doesn't much matter. The springs I get would fit anything up to an M6 screw, though I usually use M3 or #6 (approx 3.5mm diam) screws.


Cameron

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Re: Springs
August 01, 2012 04:00PM
I don't think there's a need to go making your own springs. There's a great spring available in cheap clothes pegs, fits an M4 bolt nicely, and has good strength.



You can get a pack in a €2 shop, for... €2! You can see these springs on my blog here: [numbersixreprap.blogspot.ie] I use them in my extruder, and combine two of them on each M4 bold under my print bed.

If you want to try something you could use rubber washers instead of springs. You'll see these guys use them right at the end of their extruder assembly instructions... [forum.eckertech.com] It looks like a rubber tap washer to me.

Regards,
NumberSix
Re: Springs
August 02, 2012 08:05AM
I don't use spring on my idler, I just use rubber grommets between two washers. After loading filament, I just tighten them up.

-Rob A>
Re: Springs
August 02, 2012 08:56AM
It's actually the seal from a metal roofing screw. grinning smiley




[www.eckertech.com]
[blog.eckertech.com]
[forum.eckertech.com]
Attachments:
open | download - rubber_washer.jpg (29.9 KB)
Re: Springs
August 02, 2012 11:53AM
eckertech Wrote:
-------------------------------------------------------
> It's actually the seal from a metal roofing screw.
> grinning smiley
>
> [forums.reprap.org]
> name=rubber_washer.jpg

Thanks for clarifying guys! Setting a new trend there. smiling smiley


[numbersixreprap.blogspot.com]
Re: Springs
August 02, 2012 02:07PM
Thanks for the info guys. I think I'll try your suggestion to begin with NumberSix.
Re: Springs
August 03, 2012 04:04PM
I cut pieces off a 1cm thick IKEA silicone trivet, poke a hole through, and put the pieces between washers. I use these instead of bed springs as well.
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