If I were to ask a machinest to bore out some 1" long pieces of brass tubing fron an id of .060 to .010, od is .125. Would this be fairly simple an inexpensive?
I wanted to add that my drill press just is not accurate enough. Maybe a better drill press? This would be a one time thing and I might need about 50 of them. If paying someone to do it instead of investing in some tools I might just prefer to pay if it is more economic.
Dead simple to drill out, one extra step for reaming final ID. Cost would depend on number of pieces, desired finish tolerances and who is providing the material. In general, though, this should be pretty cheap, by which I’d guess $30 set-up and $0.50 per part for simple drilling. That is a total WAG, however, with tighter tolerances boosting the price.
You want a someone to bore a .06 ID tube to give it a smaller ID? That would be a neat trick.
If you’re looking for .125 OD x .06 ID brass tube you can get it at OnlineMetals. I think that’s a pretty common size.
Wait a minute, you’ve got some 1/8" diameter brass 1" long with an inner diameter of 0.060" and you’d like it bored to an inner diameter of 0.010". Are you sure you don’t mean an inner diameter of 0.100"?
Depending on the tolerance required, that would be dead easy. You know, standard 1/8" diameter brass tubing has a nominal ID of 0.097". Would that be close enough?
Sorry about that, yes .100. I am going to be slipping them over some solid carbon fiber rods. About $3.00 each would be acceptable.
Call around to any machine shop that does precision grinding or CNC work. This task doesn’t really fall to either one but if they’re used to that kind of small detail work and precision, this will be a job their junior guy can do on simple equipment for (probably) some base charge.
Basically, there, you want a precision machine shop that does industrial work (aerospace, machinery, tool and die, etc.), not an automotive one.
Having just dealt with a bunch of them (from a non-client perspective), I’d say just take your pieces and walk in, with the attitude that it’s a tiny job and they’d be doing it for you almost as a favor. They get intrigued by small jobs and (often) like to show off.
I think that might be the best idea. I actually have quite a few little machining projects on my wish list, might be nice to have a contact I could call.
So you’re talking about a job where a shop provides the tubing, cuts to length, reams to 0.100" ID, on 50 parts for $150? I’m not feelin’ it… :rolleyes:
Here are some questions an engineer or machinist will ask:
- What’s your length tolerance?
- What’s an acceptable edge condition at the ends? Sawed or square turned?
- What’s the acceptable ID tolerance?
- Would a #38 (.1015") or #39 (.0995) DRILL finish be acceptable?
- “Slips onto carbon fiber rod” What is the diameter of the rod?
- Must it slide on the rod? Or are you going to bond it in place and size isn’t that important?
- Can you sand the rod down to use standard .125 OD x .097 ID tubing?
You can cut brass tubing by rolling a ring on it under a sharp butcher knife and snapping it in your hands if you can use standard hobby shop tubing. Faster and less deformation than a tubing cutter.
The actual finished length I will cut myself, the length of the bore or ream will be about 3/8
The edge would not be critical
.005 tolerance would be fine
The rod size will be sanded down from .125, the tube needs to make a smooth transition I can’t feel with my fingers.
It will be bonded with epoxy
The .097 id would be too large as one end of the tube will be slotted as in an arrow nock and it would be too thin. Might be worth checking on though. If the brass was still strong enough at that thickness it would save me a lot of trouble.
$50 plus material cost…that is if I have a reamer that would be close enough, like, .098-.099 or .101-.102. dont have my drill index handy.
I will send you a private message.
kk