MGN12H crappy linear rail bearing blocks

What’s more sensible than spending $9USD on a basic, possibly non working chinese no-name bearing block?

……..Spending hours and a few quid trying to do ’em up!

Parts I’ll need…

  • 3/32 Drill Bit (or possibly 2.4mm if it needs some play) …………..[edit, turns out a 2.4mm is too small! Looks like 2.5 is the go]
  • 3/32 Ball bearings (bound to loose a few)
  • Something to drill with
  • something to clamp down the carriage without damaging it

After a few minutes with the calipers and Tinkercad, I give you……….

A 3D printed clamping part for a drill press, or possibly my CNC if I can get it running…..

Plan is to

  • Print out the clamp in plain ‘ol PLA
  • Heat it up a bit with a hairdryer
  • Jam the MGN12H block in
  • Let it cool
  • clamp
  • Re-drill the holes and the 1/2 holes / guides!

Sounds easy, right?

MGN12H Block clamp

Some dimensions below…

Of note, the bearing is slightly off centre – the thickness of the right hand part of the U shape is about 0.07mm wider than the left…I don’t think that could possibly cause issues?

Now, all I need to do is to find a suitable drill bit to do the two bearing holes,

and figure out how to smooth out the 1/2 holes / grooves located inside the U shape!

On a side note, I have found / been given lots of recommendations for new block / rail combos, all coming in around the $25-35 USD range for a block and 500mm rail!

and, obviously, purchasing known good working rails at a sensible premium is the sensible thing to do, right?

……….But, I’ve got a 3D printer and a CNC, and little ‘me time’ mayaswell use ’em and burn some midnight oil!

Author: Bleugh

Early Fourties, Wife, two kids in primary school. Both of us work full time...5 years now we’ve been Back in Blighty after a decade away...It's a new country for everyone! Still finding time to tinker!

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