Drill size for Rockler 4" stainless pizza wheel kit?

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Forum topic by Tishman posted 04-25-2017 04:51 AM 491 views 0 times favorited 2 replies Add to Favorites Watch
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16 posts in 1660 days

04-25-2017 04:51 AM

The instructions say drill a 12.5 mm hole for hardwood, but I’ve heard this is not correct. It’s pretty close to 1/2” but I’ve had issues with cracking the handle I’ve turned once I install the handle into the threaded insert that if epoxied into a 1/2” hole. What’s the issue? Maybe I got some epoxy on the threads and it’s pushing it into the walls? Help! Sick of making nice handles and cracking then at the end. Thanks!

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3584 posts in 4219 days

#1 posted 04-25-2017 06:11 AM

Instructions call for 1/2” for hard wood and 7/16” for soft woods. Drill at least 1 1/2” deep.The insert should be screwed into the handle blank. You can thread a 5/16” bolt into the insert and thread it in with a wrench or buy or make a mandrel and use the drill press to install it.

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115 posts in 1294 days

#2 posted 04-25-2017 02:29 PM

As a general rule, if a hole is not going to be tapped, and a bolt or screw just passes through it, it’s called a clearance hole.

Number screws have .010 or .015 clearance on the diameter. Fractional screws generally have .030 diameter clearance. (I’ve generally used .015 clearance on 1/4 inch screws, .030 just seems kinda sloppy.)

This is a rule in tool and die. It insures what you build will fit together.

As far as converting MM’s to inches, use the multiple of .03937. That will take you anywhere you want to go. Just to remind anyone who may chide you when you get out your calculator, we went to the moon in inches.


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