Question for machinists???

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2/9/2018 8:22 AM

I ordered a piece of 3 1/2"OD 2 1/2"ID 6061 tubing from a place online. It came yesterday and it's 3 1/2"OD and 2 1/2"ID but the hole is not centered, I don't mean a little off. One side of the wall is a little over 17/32" and the other is a little under 15/32". I just wanted to make sure that this is not acceptable in any world before I call and raise hell. Thanks

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2/9/2018 8:27 AM

Send it back. You can get on the ALCOA sight and find the min/max wall thickness variation. .031" is waaay out of spec.

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2/9/2018 8:34 AM

not acceptable...

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scte3.0 pro-line trinity tekin

2/9/2018 8:48 AM

i order material everyday, I would send it back

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2/9/2018 8:50 AM

Thanks

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2/9/2018 9:14 AM

Spend the extra few dollars and order from Mcmaster-Carr and know you are getting what you ordered

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2/9/2018 9:24 AM

Not acceptable

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2/9/2018 10:01 AM

No Bueno

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Kyle Pulley
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3004 Freedom Dr. Charlotte NC 28208
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2/9/2018 10:12 AM

Not to be that guy, but im looking at the mcmaster carr website right now and the wall thickness tolerance for a tube you are describing is listed as +/-.045".

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2/9/2018 10:16 AM

Whatcha makin?

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2/9/2018 10:36 AM

When the extrusion was pressed they most likely had a problem with the mandrel, and probably ran hundreds if not thousands of pounds like that.
I would definitely send it back. if you look closely you will probably see two small marks on the id that will run the full length of the extrusion, your vendor will be able to identify which extruder mad the tube from this and will be able to address the problem with them.

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2/9/2018 10:51 AM

Depends on how much turn and bore you planning on doing. If you turn the tube to existing id, then bore to the turned od, you should be able to fix it. Just kinda depends on how much you’re takin off. i’ve seen tubes .125” off before but had the tolerance to fix it. But that was on company dime, not my own. If i spent my own money, and didnt have plenty tolerance to fix, it would definitely be going back.

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2/9/2018 11:18 AM

Not acceptable

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2/9/2018 11:21 AM

Just out of curiosity ,is the ID out of round or off center?

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2/9/2018 11:25 AM

As some have said, might be ok depending on what you're making and what the specified tolerances were when ordering.

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2/9/2018 1:24 PM
Edited Date/Time: 2/9/2018 1:46 PM

I talked to them and they claim that's in spec. It will work for what I need so I didn't push the issue. It was a $48 order with shipping. It's for 2 sleeves that will go over 2 small trim routers. It was the closest thing I could find that didn't need a ton of latheing. I just needed to take a 32nd of an inch out of the ID. There are UHMW disks that will mount to the bottom just like a normal router disk. One is a little larger than the other, nothing hi tech. The OD really had nothing to do with it other than having enough surface to mount the UHMW. I probably won't be ordering from Speedy Metals again but, I have one done and I'm doing the other after lunch. Yeah, for the free Atlas/Craftsman lathe that I hauled home 10 years ago.

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