Reaming carbon fibre tube

blek · Aug 14, 2019

Hi all

I've got some 7.00mm x 10.00mm carbon fibre tube Im wanting to ream out to 7.3mm ID and was wondering what the best way to proceed would be? I don't have experience with machining cf and have read everything from "run the lathe at half drill speed with a slow steady feed for the reamer" to "run up as fast as possible and jam it in like you just don't care!" So I'm a little confused of best practice.

Any help would be appreciated - Cheers.

azmachining · Aug 15, 2019

How deep do you need to go?

azmachining · Aug 15, 2019

Many people run reamers fast, I don't. I run about the same rpm to drill, but feed slow and I get good results. That's how I was taught long ago and that's just how I do it.

I prefer to bore over ream, that's why I asked how deep you have to go. Reamers are ok, but if a boring bar will work, use it.
Harvey has a good selection of little boring bars.

Milland · Aug 15, 2019

Low speed, sharp carbide reamer, feed as fast as you're comfortable with, and if this is something you'll be doing a lot of you'll want to get a PCD-tipped reamer for good life and cutting action.

A HSS reamer may work, but if it dulls too quickly you'll put a lot of hoop stress into the tube and may damage it. You don't want the matrix material to overheat either, and rubbing from a dull tool will do that, so my suggestion for a carbide or PCD reamer.

mark costello · Aug 15, 2019

I was taught 1/2 the speed, twice the feed. Easy to remember.

blek · Aug 15, 2019

azmachining said:
How deep do you need to go?

It will vary, 150mm-300mm so though a boring bar to fit that dia. and length would be unstable compared to a 6" reamer and going from both ends?

blek · Aug 19, 2019

Thanks for the advice all, I think I'll go with @azmachining suggestion and run drill speed with slow feed

We'll see how I go!

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