Drill And Tap Motor Mounts
01-18-2007, 10:24 PM
#1
Senior Member
Thread Starter
Join Date: May 2006
Location: Clanton,
AL
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
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.
01-19-2007, 06:56 AM
#2
Senior Member
Join Date: Sep 2006
Location: Plano,
TX
Posts: 219
Likes: 0
Received 0 Likes
on
0 Posts
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!
01-19-2007, 08:17 AM
#3
Senior Member
Join Date: Jan 2005
Location: STARID
Posts: 1,314
Likes: 0
Received 0 Likes
on
0 Posts
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.
01-19-2007, 01:33 PM
#6
Senior Member
Join Date: Sep 2006
Location: Plano,
TX
Posts: 219
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
01-19-2007, 02:18 PM
#7
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.
