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Posted: 12/31/2016 8:44:39 PM EDT
Need to turn down my JP Thermal Dissipator as the OD is to large to fit under my hand guard.
Its made of aluminum and has a .650" ID. Heck, it might not even be possible because its finned. Can anyone help me out? I would be happy to pay you, trade you parts or buy some beer for your trouble! I'm in Lorain but am willing to travel! 
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Posted: 12/31/2016 9:34:44 PM EDT
[#1]
I think that as soon as you touch a bit to that thing every fin would smash to pieces.
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Posted: 12/31/2016 10:04:12 PM EDT
[#2]
Quote HistoryQuoted:
I think that as soon as you touch a bit to that thing every fin would smash to pieces. I'm just barely a hobby machinist, and I agree. My first thought when I saw the pics was "I wouldn't even try it." |
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Posted: 12/31/2016 11:15:22 PM EDT
[#3]
You would be farther ahead to file "X" amount off the edge of each fin or possibly mill each fin down the amount needed. The mill bit might knock the fins over also.
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Posted: 1/1/2017 10:02:47 AM EDT
[#4]
Kinda what I thought but figured I'd ask.
I thought about sanding or using a file but not sure how that would turn out. I still want it to look nice as it will be seen underneath the hand rail. I thought about somehow mounting it in my drill press and using some sandpaper strips. It would take some time but might work. I need to remove between an 1/8" - 3/16" to allow for clearance in the rail. Figuring out how to mount it in the drill press would be the hard part. Anyone have any other suggestions? |
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Posted: 1/1/2017 5:24:16 PM EDT
[#5]
You'll end up with shiny aluminum edges that you might want to dura coat. Is it cast aluminum or extrusion?
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Posted: 1/1/2017 6:53:53 PM EDT
[#6]
Quote HistoryQuoted:
You'll end up with shiny aluminum edges that you might want to dura coat. Is it cast aluminum or extrusion? I'm not sure if it's cast or extruded. How can one tell the diff? I was actually thinking the contrast of the silver edges and the black body might look good. The rifle it's going on is black and Tungsten Cerakote. |
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Posted: 1/1/2017 8:07:40 PM EDT
[#7]
Looks like a perfect job for a bench mounted belt/disc sander.
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Posted: 1/2/2017 2:19:12 PM EDT
[#8]
Draw file!
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Posted: 1/4/2017 3:17:35 PM EDT
[#9]
if it is not cast, you can turn or mill it. Just don't take big cuts. Looks like they already drilled holes in it. Is it 6061?
Safe way is a sander. |
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Posted: 1/5/2017 12:11:40 PM EDT
[#10]
Turning on a thin intermittent cut is normally not a good plan... a mill with an indexer is probably a better plan.
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Posted: 1/5/2017 1:31:25 PM EDT
[#11]
Thanks to everyone who has added their thoughts to this. I think it would work best to file or sand it down to the OD needed.
With that in mind, I've come up with a simple tool to help me with this project. I'll clamp the heatsink to this fixture which will be chucked in my drill press. The bottom will be supported as well. I'll use some belt sander belts to sand it down to a nice even OD. Anyone want to turn this for me? Doesn't have to be pretty or made from some exotic metal. Again, I don't expect it for free. I'm more than willing to pay you. I'd rather work locally to avoid shipping costs but open to anyone willing for a fair price. Sorry for the crude drawing........ 
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Posted: 1/6/2017 9:01:40 AM EDT
[#12]
If nothing else, you might call ADCO, they might be able to do that for you.
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Posted: 1/6/2017 9:58:57 AM EDT
[#13]
Try looking around for a step-down rotary shaft - you might be able to find something commercially available that would work. Most likely something with a 5/8" diameter that you can bring up to your required OD with a few layers of tape.
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Posted: 1/7/2017 11:53:27 AM EDT
[#14]
Find a guy with a lathe, have him turn slugs to fit each end and claim a center in each slug.
Turn between centers and lay this or this on the fins until small enough. Easy job, I'm 900 miles away from my lathe - sorry. Good luck! ETA: Handsander video  Belt sander, hand sanding tool, sanding tool, sanding |
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Posted: 1/8/2017 11:40:29 PM EDT
[#15]
Will the cut part be visible, or installed under the handguard?
I would almost think a bandsaw might work for this. Or a Dremel. 
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Posted: 1/9/2017 4:52:27 PM EDT
[#16]
I'd hit it with a belt sander while turning in a lathe between centers. I know most machinists would cringe at the idea, but that's one of the benefits of being self tsught. If it works, it ain't stupid.
The only thing that would take much time is if you have to turn something to mount it. Let me know if you don't find somebody closer, I'm in Trumbull co. |
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Posted: 1/29/2017 6:19:59 PM EDT
[#17]
Big thanks to ARCarbon15 for helping get this turned down. It was nice meeting you today. Maybe our paths will cross again in the future.
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Posted: 1/30/2017 9:59:30 AM EDT
[#18]
Happy to help. Always enjoy meeting fellow ARFcommers. Post up some pics when you get her back together!
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