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General control line discussion => Open Forum => Topic started by: Gary Dowler on June 13, 2017, 09:07:16 AM

Title: Build tip
Post by: Gary Dowler on June 13, 2017, 09:07:16 AM

Ok here is my method of drilling mount holes for engines.  Learned this from my mentor who is.........precise....about how he does things.  Its slow, but its the most accurate method Ive ever tried.  Fit the engine to the mount.  Mark one hole location, only one.  Drill this one hole.  Refit the engine and secure that one bolt.  With it secured mark another hole location.  Remove the motor, then drill this second hole.  Remount the motor and secure now with two bolts.  Mark hole 3.  Remove motor, drill hole, and repeat the above process until all 4 are drilled.  Its slow, its tedious, but there is nothing more accurate for drilling out engine mount holes.

Title: Re: Build tip
Post by: john e. holliday on June 13, 2017, 09:25:25 AM

That is the way I do most of mine.   H^^

Title: Re: Build tip
Post by: Perry Rose on June 13, 2017, 10:13:18 AM

Lee machine shop has drill jigs for many engines.

Title: Re: Build tip
Post by: Dave Holtsclaw on June 13, 2017, 04:11:34 PM

I drill mine one at a time too. Once I started doing this a lot of un needed problems went away. It does take longer but worth it.

Title: Re: Build tip
Post by: tom creasey on June 13, 2017, 06:16:26 PM

I have a drill jig for my engines.....bought from Jim Lee.....to me it is worth it

Title: Re: Build tip
Post by: Randy Cuberly on June 13, 2017, 07:12:01 PM

I always make a crutch with the engine mounted as the final assembly of the crutch.  This makes for a very positive alignment of the engine mounts with the crutch mounts and avoids any undue stresses on the engine or the fuselage when the engine is bolted in.

Randy Cuberly