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Fitting Custom Spindles

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ktb_919 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ktb_919 Quote  Post ReplyReply Direct Link To This Post Topic: Fitting Custom Spindles
    Posted: Dec/04/2011 at 1:52pm
Does anyone have an opinion as to whether press fitting or knurling and shrink-fitting a spindle into a custom upright is a more preferable option? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob71zilla Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 8:16am
I would say press fitting is always the better solution if you have the capability of doing it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote collinskl1 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 9:47am

I don't have any experience with a spindle like that, but in similar applications like wheel studs, various ball joints, and non spinning shafts I prefer a straight knurl and press fit. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ErikHardy Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 12:46pm
We use the stock trx450 spindle and press them into our knuckles with about .002" interference. The only problem we have had is the spindle snapped....in the parking lot..Disapprove...somehow
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CLReedy21 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 1:07pm
We've used a non-knurled shrink fit for 3 years now and it seems to work fine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote schooter Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 1:35pm
Simple press fit without knurling and a couple thousands interference is also what we did for years without issues. I've only used knurling when the part may need to resist a torque (like wheel studs) or when your clamping an air bag and need some surface roughness.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dillon_b12 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 3:12pm
Non-knurled press fit works fine.  Throwing the part to be pressed in the freezer for a little while can help shrink it down to make the pressing process a little easier.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote collinskl1 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 3:25pm
If you're concerned about not having the ability to press something "by hand" on an arbor press or similar, use a tensile test machine in your engineering lab.  That should be a relatively easy way to get the tonnage you need as well as collect data if you so desire.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red_Beard Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 3:32pm
Originally posted by dillon_b12 dillon_b12 wrote:

Non-knurled press fit works fine.  Throwing the part to be pressed in the freezer for a little while can help shrink it down to make the pressing process a little easier.


We would put one part in the freezer for a couple of hours then take the other part and take a heat gun to it.  Works slick!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greenreed1936 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/05/2011 at 3:32pm
We have always waited until we had a lot of things to press fit and head to the grocery store and pick up a cooler full of dry ice.  makes things very easy to accomplish.  Usually just drops right in.
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