Chainstay to Dropout Options

[shand]

250 rpm will be way too much.
A normal cutting speed for HSS (ie 25-30 m/min) will work out at around 100 rpm, depending on the diameter of the blade ofcourse.

I'm sure you're right Marten, I bow to your superior knowledge! I do know that I hardly ever engage the back gear so it's probably not low enough, but it does work and I guess the downside would be trashing my cutter sooner?

[Tom Kellogg]

We run @ 96 RPM. No issues with heat or chipped teeth. Tooling seems to last almost forever. The only tooling issues we have is when we are cutting seat tube slots. Our binder bosses are 4130 heat treated. They are the best in the business, but they are pretty hard on the cutters. We ended up getting a solid carbide saw and the problem went away.

[Clockwork]

Thanks for everybody's input. I have a milling attachment for my lathe and a back gear, so I'll be doing some experimenting.

Thanks, Joel

[marten]

}id I guess the downside would be trashing my cutter sooner?

Indeed, wear will be of the scale, think drilling a 10mm hole in steel with 2500 rpm

Next time you are at a tool place pick up one of those sliderules to calculate speed and feedrates for various diameters of drills etc

[shand]

think drilling a 10mm hole in steel with 2500 rpm

What! I'm gonna have to stop doing that too? That's it, I ain't coming back here......

[marten]

] That's it, I ain't coming back here......

In that case you might want to go here: http://www.flowdrill.com/english/introduction.htm

;)

[shand]

In that case you might want to go here: http://www.flowdrill.com/english/introduction.htm

;)

That rules! I'm doing all my bottle bosses like that from now on. Just need to step up the gearing on my drill press and do some heavy leaning. I'll keep you updated.....

[MBudd]

I'd always liked hooded dropoutsfor the massive weld surface they give to the stays, on bikes I build with plate dropouts I give myself this headache to aproximate it.


M. Budd
Budd Bike Works
www.buddbikes.com