taycat
Member
- Messages
- 394
- Location
- yorks uk
here's a jig i made for accurate drilling of bike crank arms when i want to shorten them for some of bikes i am planning on building.
will prob get shorter centre pce but used what i had.
it's made from 50x50x5 ali angle.
only hole i made sure was cock-on was centre one, then marked out spacings and marked line across.
took it up to model eng club and got someone to show me how to set up miller with centredrill instead of cutter.
after checking everything was square just set it up on centre hole and moved bed to each line and centre drilled each hole, after which i drilled through.
will prob get shorter centre pce but used what i had.
it's made from 50x50x5 ali angle.
only hole i made sure was cock-on was centre one, then marked out spacings and marked line across.
took it up to model eng club and got someone to show me how to set up miller with centredrill instead of cutter.
after checking everything was square just set it up on centre hole and moved bed to each line and centre drilled each hole, after which i drilled through.
