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Drill And Tap Motor Mounts

Old 01-18-2007, 10:24 PM
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kilr95ss
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Default Drill And Tap Motor Mounts

Before I mess up another set of Speedmaster motor mounts, what is the best way to do it? The top of the cylinder on my MAC .21 is in the way of making a straight shot at marking the holes.
Old 01-19-2007, 06:56 AM
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007clint
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Default RE: Drill And Tap Motor Mounts

I used a dentist pick which is an 'L' shaped sharp insturment to scratch the speedmaster mount (yes, our local hardware store here in Texas sells them) and then a drill press to drill the holes square. I then hand threaded the holes - it worked great!
Old 01-19-2007, 08:17 AM
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jdoug
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Default RE: Drill And Tap Motor Mounts

Good tip...Also, be sure to use the correct drill bit for the thread size you are tapping to. It will make a big difference in strength of the threads. ...and, it's messy, but if you lube the hole as you are tapping (especially AL.) the screw will have less slop in the hole and be stronger too.
Old 01-19-2007, 09:26 AM
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Default RE: Drill And Tap Motor Mounts

When tapping aluminum it's also important to back out the tap regularly so you can clear out the metal chips.
Old 01-19-2007, 10:34 AM
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Default RE: Drill And Tap Motor Mounts

I cheat....i put my mounts in a tapping machine
Old 01-19-2007, 01:33 PM
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007clint
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Default RE: Drill And Tap Motor Mounts


ORIGINAL: jdoug

Good tip...Also, be sure to use the correct drill bit for the thread size you are tapping to. It will make a big difference in strength of the threads. ...and, it's messy, but if you lube the hole as you are tapping (especially AL.) the screw will have less slop in the hole and be stronger too.
VERY IMPORTANT (Sorry I didn't add that). I use Cutting Oil and matched tap/drill set (got them at Lowe's). I back the tap out several times, hit it (and the partially complete hole) with the air gun to clear unwanted chips that will mess up the threads, and re-oil.
Old 01-19-2007, 02:18 PM
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Ron Olson
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Default RE: Drill And Tap Motor Mounts

Been tthere with Speedmaster motor mounts. Bill uses some tough aluminum for his. I gave up and bought an Octura mount. After I taped it I removed the channel under the engine with a hacksaw to make it more like a Speedmaster and dumped a lot of weight.
Old 01-19-2007, 06:06 PM
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kilr95ss
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Default RE: Drill And Tap Motor Mounts

Thanks for the help. Im using a #29 drill bit and a 8-32 tap.

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