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Reaming for a sliding fit

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MW06/12/2016 09:30:54
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Posted by Neil Wyatt on 06/12/2016 07:27:52:

> The test reaming I did was with a hand reamer (new Dormer 6mm) and putting the whole reamer fully through gave a press fit for the dowel.

frown

Yep, i'd concur there; I use a 6mm and 8mm reamer oftentimes and it always gives a press fit.

It is supposed to be bang on the number so it doesn't surprise me if it's slightly tight for a nominally sized bar, when you think about it this makes sense as theres no/ or little gap between the pieces so they seize slightly.(depending on the overall roundness, they wont be likely exact copies of each other in terms of form)

 If you keep moving them about they eventually wear into each other.

Michael W

Edited By Michael Walters on 06/12/2016 09:33:32

Tony Pratt 106/12/2016 09:47:47
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Posted by Michael Gilligan on 05/12/2016 20:34:46:

Assuming that you have one reamer, for the 'tight' holes, Matt ... I would be tempted to either:

  • lap the 'free' holes to a suitable size, or
  • make all the holes the same size, and polish one end of the pins down a little in the lathe, before assembly.

MichaelG.

Matt, Michaels method is the best way forward, produce the blind hole using a machine reamer, this will be the fixed position & hopefully will be a interference fit for the dowels you already have[don’t use silver steel], then ream the holes in the removable part. Polish one end of the dowels to be a slide fit in this removable part.

Assemble dowels into fixed part, it will help if you polish a lead onto the dowel also it is essential that the dowels go into the holes squarely.

Tony

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