Quote for Simple Aluminum Tubing Part

[BrianTx21]

I am a hobbyist trying to start my own business up around March. Just trying to get an idea of pricing on CNC machining. I have a simple part I need a qoute on. I have more parts just testing the waters.

All made out of 6061 aluminum tubing ID 1.2 OD 1.5, for 20, 50, 100 parts each. All measurements in inches.

Part 1
6 inch long section
1/2 inch threaded inside both sides
machine finish


Thanks

[mactec54]

Originally Posted by BrianTx21 I am a hobbyist trying to start my own business up around March. Just trying to get an idea of pricing on CNC machining. I have a simple part I need a qoute on. I have more parts just testing the waters. All made out of 6061 aluminum tubing ID 1.2 OD 1.5, for 20, 50, 100 parts each. All measurements in inches. Part 1 6 inch long section 1/2 inch threaded inside both sides machine finish Thanks

Hi what is the threads per inch and do you have the gauge or piece that
will screw into the tube

[BrianTx21]

I am wanting to make a modular system so all the parts will screw into this main body.I'm looking for a single shop to make me all the parts I need, so it won't be like getting one part here another there etc. The next part to be planned was a end cap for this one. As for threads per inch I honestly don't know. I don't even know how to guage that.Something that it takes a good 5 or 6 turns to get together for a strong hold. I guess use your discretion on that aspect.



Brian

[gmfoster]

Originally Posted by BrianTx21 I am a hobbyist trying to start my own business up around March. Just trying to get an idea of pricing on CNC machining. I have a simple part I need a qoute on. I have more parts just testing the waters. All made out of 6061 aluminum tubing ID 1.2 OD 1.5, for 20, 50, 100 parts each. All measurements in inches. Part 1 6 inch long section 1/2 inch threaded inside both sides machine finish Thanks

1.30 each paid in advance plus materials. Paid in advance and no refunds......

No one can respond to a request like this. Your first step has to be to decide what you need and then request a quote with some specs. I have no idea what you want made.

You need a drawing and you can't leave your unit totally with out tolerances of any kind. A shop can and some would low ball you and use some totally non standard thread Then in the next item you need they double the bid and no one else could easily build to thier non standard tolorences. You say you want 1.5 in OD but with no specs you can't reject 1.6 in OD...

If you want something built to spec you have to provide the specs. Especally if you have any hope of ongoing production..

Garry

[BrianTx21]

gmfoster thanks for the reply. Like I said I am new to this and I appreciate your help. I really have no idea on tolerances but I really would like it as close to the specs as possible. 1.5, a little thicker is more managable than thinner.

As for threads, nothing to fine becuase I really don't want it to strip easily.

I will work on posting a drawing soon. I have been working with some CAD software (just the free stuff from emachineshop) and I really not having a easy time with it. I can do some in paint and for some parts that would be enough I think. Most are pretty easy. There are some that I can do a top/front/side view of and maybe that can help. The more difficult parts I would have a prototype done and have sent for a better understanding .

Let me get on the drawings of some of the simpler stuff.

And for everyone who pm'ed me, thanks for the help here and I will get things updated for a better understanding soon.

Brian

[BrianTx21]

I tried to do some paint drawings of it and it kept saying they were too large. I tried to shrink them down but it didn't work, you couldn't make them out. Can anyone suggest a diff media to use then MS Paint?

But I was able to find some example parts, I hope this helps but I still need help in understanding tolerances.

The 1st one is a main body as described above. Provided is a sample, but no recessed hole.
Here are the specs:
6 inches long
1.5 OD
1.2 ID (But could be as large as 1.25, larger is better than smaller here)
Threaded inside for 1/2 inch

The 2nd is a part to screw into it. I have provided a sample as an existing piece.Note the example is not to scale or threaded. (and no holes)But rather to give you a general idea of what it would look like.
Here are the specs:
5 inches long
1.5 OD
1.2 ID
1/8 inch deep grooves spaced 1/4 inch the length
1/2 inch threads on either side(so the grooved section is only 4 inches)

I can send the drawings through email but can't get them to post here. PM me with your email addy if you want to recieve a copy of the drawings.

I hope this helps understand what I'm going for.

Brian

[Ken_Shea]

Brian,
Example of tolerance specifications.
What we are needing to know is, with a dimensional length on your drawing of 6", how much longer or how much shorter can this part be and still be an acceptable part.

If the OAL is not critical them put OAL tolerances to + / - .005
This is not a tight tolerances and easily accomplished.
This would mean any part measuring 5.995 to 6.005 OAL is an acceptable part.


Same information for tubing OD and ID, if this is not critical then you can use the commercially available tubing.

Internal thread fit standards are 2B for medium fit or 3B for close fit, my guess is a 2B would be OK on this but since I don't know what it is I cannot say for sure.


If you have any specific question that I may be able to help with let me know.

Ken

[Ken_Shea]

double post

[BrianTx21]

Gotcha Ken and thanks.

I am definately not that picky so a tolerance of + / - .005 is acceptable. As for threads I want it tight but I do want you to be able to remove it with a bit of effort. So I guess 2B would be acceptable. I do want a strong fit.

Brian

[BrianTx21]

On the advice of a few people who pm'ed me I am ending this thread till I learn how to use a CAD program or something. I have no guarantees even with the examples provided that I will get remotely what I want so I'm gonna play it safe for now.

Thanks for the responses and pms, it was all appreciated.

Brian