Gallery, Projects and General > How do I??

boring a compound angle in a block?

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shipto:
Yeah should have bored hole first but lack of forward planning got me again. However I think I have it sussed now. The reed is sandwiched between this adapter and the engine and the carb will slot into this hole I am boring with o ring to seal it and I need to work out a way to secure it which may be doing something from airbox not sure yet

Jasonb:
I tend to use a pair of angle plates for things like this. Clamp one angle plate to the lathe cross slide at 33degrees to the lathe axis. Bolt another angle plate to that which is tilted 25deg from horizontal and clamp your block to that. Drill out most of the waste and finish with a boring bar

DMIOM:
especially if you're going to start drilling out the waste, would suggest you use a slot-drill or other end-cutting milling cutter to produce a flat spot first, otherwise when you try with a conventional twist drill its likely to skid off-line and/or grab your workpiece.

Dave

PekkaNF:
But if he is boring this on lathe, flat is easily turned.

Pekka

Jonny:

--- Quote from: shipto on October 15, 2015, 11:05:01 AM ---The reed is sandwiched between this adapter and the engine and the carb will slot into this hole I am boring with o ring to seal it and I need to work out a way to secure it which may be doing something from airbox not sure yet

--- End quote ---

Surely an adaptor with flange to suit the reed valve with stand off to suit o/d of carb via silicon tube way to go. Just start of adaptor make the leading edge sharp from bore of silicon.
Then could attach to carb with something like a Mikalor and same to air box.

From memory these adaptors have moulded sections to them giving correct angle. Yours you would have to machine front face at that desired angle.
Whilst at it smooth out prior to the reed usually pretty good any way.

What engine is it, SX, KX, CR?

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