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Forum * Motor Mountings * * M3.10.100.K Springs for loading motors against the racks. < Previous Next >

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Gerald_D
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Username: Gerald_d

Post Number: 380
Registered: 11-2005
Posted on Sunday, November 05, 2006 - 07:02 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)
The springs for loading the motors should have a tension of about 12kg [25 lbs] while extended to about 128mm [5"] between the centers of the eyes at the ends of the springs. None of these specs need to be very exact.

I had springs made in Cape Town by my regular springmaker who uses pre-hardened wire and manages to wind a very tight spring. His springs need quite a lot of force to start opening the coils - a lot of force is needed before anything moves. Springs which are heat-treated after shaping are a lot more "relaxed". The drawing showing 38 turns of 2mm wire around a 12mm mandrel is therefore only a guide for someone who is going to cold-form springs for you.

I would very strongly suggest that you buy a cheap fisherman's scale to check the actual motor spring tension. If necessary, the anchor point of the spring can be moved to make it tighter, ot the spring can be stretched to make it looser.

Regarding catalogue springs, the McMaster-Carr / 9654K324 looks like a good candidate.

Here is "spring shop" in Germany: www.federnshop.com Their Z-144I or RZ-147OI look like possibilities.
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David Rosenbleeth
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Username: Dave_r

Post Number: 12
Registered: 07-2006
Posted on Tuesday, November 07, 2006 - 05:24 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)
I've done business with these guys and found them to be very knowledgable and helpful:

http://www.centuryspring.com/

Dave
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Gerald_D
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Username: Gerald_d

Post Number: 390
Registered: 11-2005
Posted on Tuesday, November 07, 2006 - 06:50 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)
Thanks Dave. Their S-597 looks good.

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