Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Engineering Techniques and Materials. => Topic started by: essex2visuvesi on September 09, 2011, 02:01:04 pm
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how do you guys make the holes in your hull for the propshaft?
using a drill i cant get the correct angle as the chuck hits the hull.
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A small pilot hole at what angle you can then open it up with a needle file......that'd be my guess.
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I use a dremel cutting wheel to open a slot undersize to the propshaft, then a round file to open the slot to exactly the size I want it, Then resin and mat to secure it.
Others open the slot way oversize and fill the hole with car body filler. I really don't see why, you make so much extra work for yourself...
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Drill a hole the correct diameter vertically into the hull, then use a rat-tail file to open out the hole into the right-shaped ellipse i.e. gradually making the hole a shallower angle as you work the file. If the hole is in the back of a skeg then drill the largest hole you can without damaging the hull and open it out with the rat-tail file or files.
DM
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I use long series drills untill I am very close to the size I want then file it out.
Brian
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:D :embarrassed: easy when you know how!
Cheers guys!
Off to find a 6mm rat tail file now!
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Drill a hole the correct diameter vertically into the hull, then use a rat-tail file to open out the hole into the right-shaped ellipse i.e. gradually making the hole a shallower angle as you work the file. If the hole is in the back of a skeg then drill the largest hole you can without damaging the hull and open it out with the rat-tail file or files.
DM
Dave wrote it, I do it the same way. :-))
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I've only just got the joke in the subject. :embarrassed:
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When doing the one for the Revell Snowberry, which is not really amenable to the vertical, then make it oval system, I used a long, thin, very sharp bit, in a hand drill, then opened it out with a file. Clamping the skeg in a workmate helped, as well, since the rotating bit did its best to separate the hull halves.
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(http://s4.postimage.org/26oaezbqc/147.jpg) (http://postimage.org/image/26oaezbqc/)
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Goodness cliff2903... {-) ...that is a loooooooooooooooooooooong series twist drill O0 .............
I could also imagine the hill firmly clamped down in a pedestal drill table with the planned axis of the drilling truly vertical.....you know...to minimise drift etc...... Derek