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What kind of shop can do this?
#8180352
02/22/21 06:52 PM
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Joined: Aug 2012
Posts: 1,929
nak
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I have a 36" diameter x 1/2" 316 SS disk, with a 18" hole in the enter (its a big Orifice Plate, for metering natural gas).
I need two 1/4" holes bored from the outside edge of the disk to the center opening...so each 1/4" bore will need to be 12" deep.
I'm in DFW. Any idea what kind of shop could do this and how much it might cost? I called a couple of local machine shops and they were WFT?
We are turning it into a Fire Table and the holes will be for the propane supply to the center. the burner itself will be an 18" bowl (a bowed orifice plate) and we need to get gas there "magically" with no visible lines.
NRA Lifer / Member TSRA
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Re: What kind of shop can do this?
[Re: nak]
#8182644
02/24/21 06:40 PM
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Joined: Dec 2008
Posts: 32,748
FiremanJG
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Re: What kind of shop can do this?
[Re: nak]
#8182655
02/24/21 06:45 PM
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Joined: Dec 2008
Posts: 32,748
FiremanJG
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I thought about it some more. I have what is needed to do it. But, I can't guarantee the bit won't walk toward the end of the cut. That's why this is so tricky.
Meaning the bit might end up out of the side of the plate instead of the center 18" opening.
Laser beams, we need freakin laser beams!
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Re: What kind of shop can do this?
[Re: nak]
#8182668
02/24/21 06:55 PM
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Joined: Jul 2014
Posts: 2,872
onlysmith&wesson
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Tell me again how long the bore will be from the outside Ø to the inside Ø? I come up with 9"
An unethical shot is one you take, that you know you shouldn't.
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Re: What kind of shop can do this?
[Re: nak]
#8182670
02/24/21 06:58 PM
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Joined: Sep 2010
Posts: 1,920
Blank
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Better off to TIG weld the two new stainless feeder tubes underneath, with fittings on the outside edges.. That's simple for any quality shop.
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Re: What kind of shop can do this?
[Re: onlysmith&wesson]
#8182728
02/24/21 07:49 PM
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Joined: Sep 2007
Posts: 3,066
oldoak2000
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Tell me again how long the bore will be from the outside Ø to the inside Ø? I come up with 9" I get 9" cut too - a good drill press with at least 12" opening and THREE passes with progressively longer 1/4" drill bits ( 4", 7", 10") assuming 1" in the chuck? also assumes you can hang the bottom of the piece below the base, and might need a bit more than 12" opening depending on base of the press & inside curvature of the work piece.
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Re: What kind of shop can do this?
[Re: nak]
#8182733
02/24/21 07:59 PM
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Joined: Jul 2014
Posts: 2,872
onlysmith&wesson
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Send two drawings to the shops that you have already talked to. One of the piece in it's current state, number it. Send another drawing of the final piece with the thru holes. Note on the finished drawing "made from ______" and fill in the number of the drawing number of the piece in it's current state. Draw it in 3rd angle projection. Let them know you will be providing the "made from" piece. Tolerances on the thru hole Ø to be -0/+ .010". The thru Ø should be > than the tubing by .010". Any machine shop can do this.
PM me if you want drawings, I'll tell you what they need to look like.
An unethical shot is one you take, that you know you shouldn't.
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Re: What kind of shop can do this?
[Re: nak]
#8182750
02/24/21 08:10 PM
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Joined: Jul 2014
Posts: 2,872
onlysmith&wesson
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Machine shops see drawings like this all day long, they'll know exactly what you need.
Last edited by onlysmith&wesson; 02/24/21 08:12 PM.
An unethical shot is one you take, that you know you shouldn't.
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Re: What kind of shop can do this?
[Re: nak]
#8183155
02/25/21 02:14 AM
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Joined: Dec 2008
Posts: 4,065
LonestarCobra
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I could do this in my shop, but I'm probably 7-8 months out on working it in. Welding tubing below would work unless you had to have it flat on bottom. If that's the case, another option would be to mill a slot for the tubes just larger than the tubing and tack them in there.
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Re: What kind of shop can do this?
[Re: nak]
#8183190
02/25/21 02:46 AM
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Joined: Dec 2012
Posts: 4,446
TexasKC
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That's a job thats easier said than done. Keeping the hole straight is not a problem. The problem is finding a machine with 9" of stroke. My Bridgeport mill had 5" of stroke, drill press had 6". When drilling a hole that deep you have to be able to withdraw the drill in order to clear the chips and supply lubricant. I would suggest finding a shop with a horizontal mill or radial arm drill capable of drilling that deep. It won't be cheap.
In the end, it's not the years in your life that count, it's the life in your years.
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Re: What kind of shop can do this?
[Re: nak]
#8183406
02/25/21 10:53 AM
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Joined: Jul 2014
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onlysmith&wesson
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Anyway to cut it in half, and pass from inside, and outside to complete? This reduces the bore to 4.5". Not knowing how this is going to finish out, or what surfaces will be visible it's hard to say.
An unethical shot is one you take, that you know you shouldn't.
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Re: What kind of shop can do this?
[Re: nak]
#8183787
02/25/21 05:53 PM
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Joined: Oct 2012
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Sneaky
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That’s a big orifice plate.
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