36 is the diameter of 1 1/8th 853, so its not a totally stupid idea, but as you've stated that it sucks in below the cups I still think you'll run into distortion issues.
It won't be a drill you would need, they're designed to drill down into material, you're just attempting to remove material on the id, so its a fuck off end mill or a swathing cut on a circumference cutter. You then have to ask how you're going to hold the frame whilst cutting, plus centring. None of these are insurmountable, but time consuming. As its a complete frame already, you will need a big mill to do the job, I have 3 mills and only the Bridgeport would be able to fit it I'd imagine. So...... When you add up the costs involved in set up and machine time, a new head tube from winston (most experienced frame builder in london) at 90 squids sounds like a much more cost effective way of going about it.
I'm in no way against cutting things up and trying to put them back together, I think its a great mindset to have, to ask "what if I......" I just get the feeling that you're not doing this for fun, but actually just want an 1 1/8" fork, and the best way is to go to Winston.
While you're here, are you still not doing any little jobs/focusing on frames? I just want some small bits and bobs doing. Will go to Winston if not but would rather come to you first
Afraid not, between you and me I'm stopping doing almost any custom work either in the next month. Winston is your best bet, but he is permanently on holiday. Fish ain't going to catch themselves....
36 is the diameter of 1 1/8th 853, so its not a totally stupid idea, but as you've stated that it sucks in below the cups I still think you'll run into distortion issues.
It won't be a drill you would need, they're designed to drill down into material, you're just attempting to remove material on the id, so its a fuck off end mill or a swathing cut on a circumference cutter. You then have to ask how you're going to hold the frame whilst cutting, plus centring. None of these are insurmountable, but time consuming. As its a complete frame already, you will need a big mill to do the job, I have 3 mills and only the Bridgeport would be able to fit it I'd imagine. So...... When you add up the costs involved in set up and machine time, a new head tube from winston (most experienced frame builder in london) at 90 squids sounds like a much more cost effective way of going about it.
I'm in no way against cutting things up and trying to put them back together, I think its a great mindset to have, to ask "what if I......" I just get the feeling that you're not doing this for fun, but actually just want an 1 1/8" fork, and the best way is to go to Winston.