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Old 03-04-2012, 9:21 AM
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Calif Mini Calif Mini is offline
Join Date: Jan 2009
Location: Fremont California
Posts: 362
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Default Drill bushing

I made a few drill bushings and seemed to work OK.



Started with a drill bushing that was 9/16". Wanted to have something substantial and not wimpy like a 1/4" that could deflect easily.

Then switched to the 5/8" bushing and then removed all and reamed to 11/16".

Nice and snug.

I first squared the jig with a dial indicator, and centered the mill over the jig bushing with a co-ax indicator. All was pretty square and centered before starting any drilling.

If the hole is off 1/64", with the TM receiver that has the scope rail forward and bored for the barrel, there could be an interference issue. Just something to avoid before actually doing any drilling.

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