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  #81  
Old 07-06-2022, 04:24 PM
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Quote:
Originally Posted by milomilo View Post
That was my thoughts at the start of the lead screw discussion. I expect he has plenty of other things to do beside making your own.
There is a bearing fit on the shaft that is larger then the acme threaded section.
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  #82  
Old 07-06-2022, 06:12 PM
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Quote:
Originally Posted by OldRedFord View Post
There is a bearing fit on the shaft that is larger then the acme threaded section.

Ok. So what’s the problem?

I can think of two ways to deal with that at a quick thought.


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  #83  
Old 07-06-2022, 07:39 PM
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Originally Posted by greywynd View Post
Ok. So what’s the problem?

I can think of two ways to deal with that at a quick thought.


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I honestly don't see any other way to make a new part. It does move a 300# hunk of vast iron forward and back.
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  #84  
Old 07-06-2022, 10:26 PM
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But what force is required to move that 800lb ?I have seen them piece ball screws together and they held .
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  #85  
Old 07-07-2022, 07:10 AM
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I just bought some acme rod from McMaster,it was cheap (i think it was cheap).
Tim,you need to watch those pakis build shit,fix shit,you can get some good ideas from those guys.
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  #86  
Old 07-07-2022, 07:44 AM
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Quote:
Originally Posted by OldRedFord View Post
I honestly don't see any other way to make a new part. It does move a 300# hunk of vast iron forward and back.
Buy the threaded rod.
Machine the ends as needed.
Cut and drill the large end of the old rod, so you and press fit in the new threaded portion. 0.0005-0.001" press will be ideal.
Cross drill and pin, again press fit. It will last a long time.

300 pounds on lubricated ways does not take a lot of force to move.
What you need is minimal backlash.
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  #87  
Old 07-07-2022, 03:19 PM
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Thanks for typing that out for the young grasshopper.

Being on the cross slide, backlash for most surface grinders isn’t a big deal either. If one is doing what we always called ‘side wheeling’ to do sides of slots and such, it does get a little more critical.


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  #88  
Old 07-07-2022, 07:50 PM
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Well, I’ll add fuel to Tim’s fire. Here is Abom79 attempting a second time to make a compound lead screw for his American pacemaker lathe. At least he posted his first failure, I guess, to show he is not perfect.

https://youtu.be/-G-bxCoYQMk


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  #89  
Old 07-07-2022, 09:17 PM
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Huh. I have two 11’ lengths, and two 7’ lengths of acme screw in that size at home. Cost me about $1100 Canadian, with shipping, duty etc from the states. 2/3’s of that was the trucking and customs.


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  #90  
Old 07-07-2022, 09:34 PM
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Quote:
Originally Posted by toprecycler View Post
Well, I’ll add fuel to Tim’s fire. Here is Abom79 attempting a second time to make a compound lead screw for his American pacemaker lathe. At least he posted his first failure, I guess, to show he is not perfect.

https://youtu.be/-G-bxCoYQMk


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Huh. Kind of cheating using 12L14.

The last acme threads I did last fall were all stainless. Those are worth having carbide inserts for, but even then, I think one tip lasted through all the parts I did. (Set of three if I remember right.)


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