Shrinking disc? |
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Shrinking disc? |
bbrock |
Jun 13 2017, 09:05 AM
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#1
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I've seen shrinking discs mentioned or discussed on a few older threads but would like to see what people think today.
I have a small oil can spot (~ 3" wide) following a panel patch that needs to be shrunk, and I'm sure there will be more before this project is finished. I don't own an O-A torch but have MAPP and Propane. But the discs look like a much safer and less error-prone way to go. So what do you think of these things? Better than a torch for a nube? Are they all pretty much the same, or is there a particular one that stands out as better? Probably going to mount it on my ancient, bomb-proof 4" Makita with a 5/8" arbor adapter. I have an old 7" Craftsman that I rarely use because it is unwieldy and impossible to get into many places. Thanks! This community rocks! |
914GT |
Jun 13 2017, 09:15 AM
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#2
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Senior Member Group: Members Posts: 1,100 Joined: 11-October 04 From: Tucson Member No.: 2,923 Region Association: Southwest Region |
I like to use a shrinking disk. It gives me better control and I can apply heat only to the high spots. A torch works but you have to be careful or you can make things worse. I used the disk quite a bit to straighten the sides of a 59 VW bus last year. It can get noisy when using it, so hopefully you don't have neighbors close by.
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76-914 |
Jun 13 2017, 09:22 AM
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#3
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Anyone have a video of one of these being used? (IMG:style_emoticons/default/beerchug.gif)
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bbrock |
Jun 13 2017, 09:36 AM
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#4
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
This makes it look easy. https://www.youtube.com/watch?v=rt07pLebQwQ Good to know about the noise, but I think I'm okay with the neighbors... Here's a pic of my house: |
maxwelj |
Jun 13 2017, 09:58 AM
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#5
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rebuilt member Group: Benefactors Posts: 278 Joined: 8-January 04 From: Owasso, OK Member No.: 1,532 Region Association: None |
One of our members has a how to thread.
http://www.914world.com/bbs2/index.php?showtopic=67022 |
rick 918-S |
Jun 14 2017, 06:27 AM
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#6
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Hey nice rack! -Celette Group: Members Posts: 20,680 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
Try one. They work Great with practice. they are on ebay all the time.
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LowBridge |
Jun 14 2017, 06:34 AM
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#7
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Member Group: Members Posts: 370 Joined: 10-August 15 From: Lunenburg, MA Member No.: 19,045 Region Association: North East States |
they work fine for small adjustments when trying to reduce a high spot, but it works best if you use 2 people... 1 to heat and 1 to cool quickly with a cool wet rag, you will have more control using 2 people
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jpnovak |
Jun 14 2017, 06:53 AM
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#8
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They call me "Nanoman" Group: Members Posts: 231 Joined: 26-August 09 From: Austin TX Member No.: 10,736 Region Association: Southwest Region |
I have a 4.5 inch shrinking disk that works great. Its perfect for pulling dents.
If you have an "innie" dent you push it out to make an "outie" and then shrink it down. I like the smaller one since I can operate the grinder with one hand and a wet rag in the other. You can see the high spots "blue" when heated and then shrink them down. My method is to hammer and dolly to shape and then use the shrinking disc to effectively plannish the surface finish. They do not work great on inside concave curves. Just from the standpoint of access. |
Mark Henry |
Jun 14 2017, 07:02 AM
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#9
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
What ever happened to John Kelly and ghiaspecialties?
He seems to be MIA now. (IMG:style_emoticons/default/confused24.gif) His shrinking disc had issues with edge cracking and he recalled them. I see most discs is just a stainless sheet pressed to shape, couldn't you make the same out of some SS 1/8" plate? |
76-914 |
Jun 14 2017, 07:24 AM
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#10
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
This makes it look easy. https://www.youtube.com/watch?v=rt07pLebQwQ Good to know about the noise, but I think I'm okay with the neighbors... Here's a pic of my house: (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/happy11.gif) |
Spoke |
Jun 14 2017, 09:24 AM
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#11
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
I have a shrinking disk but not used it much. The directions said to spin it at 3500 RPM but my buffer only does 1800 RPM. What tool will spin it at 3500 RPM?
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rhodyguy |
Jun 14 2017, 11:54 AM
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#12
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,188 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
John and his wife bought and are running a bnb over on the wa coast in moclips.
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bbrock |
Jul 10 2017, 10:33 AM
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#13
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Just wanted to give a "thank you" for all the feedback you gave on shrinking discs. I bought one and had the chance to use it over the weekend. Great tool!
Worked on repairing rust on the tail and rear trunk section. On the tail, I had to weld up a bunch of holes left by the spot weld cutter. That left the surface a bit lumpy. It took several passes with the shrinking disc and some hammer and dolly, but I got the lumps smoothed to within 1/32". I think I could get it perfect with more hours of work, but I'll take the 1/32" of filler in exchange for time to move to other challenges. On the trunk floor, I cut out the old chassis number stamp from the donor piece, welded in a blank, and stamped the correct number for my car. Felt like a car thief doing it, but it was fun. But ended up with about a 1/4" high bump at the edge to be butt welded due to stretched metal. Several passes with the disc and just a little hammer and dolly brought everything back to straight for a tight butt weld. I'm sold! And very impressed with how easy and darn near foolproof it is. (IMG:style_emoticons/default/piratenanner.gif) Thanks again for steering me right. |
Mark Henry |
Jul 10 2017, 10:49 AM
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#14
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Nice property...are you a dental floss tycoon? (IMG:style_emoticons/default/biggrin.gif)
https://www.youtube.com/watch?v=DmcYTShN4Fk |
bbrock |
Jul 10 2017, 02:30 PM
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#15
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Nice property...are you a dental floss tycoon? (IMG:style_emoticons/default/biggrin.gif) Thanks. I wish I owned more than 23 acres of that view, but we like it. I live down this road a piece: (IMG:style_emoticons/default/av-943.gif) Okay, maybe not. That photo of my house is kind of a lie because the view blocks out the four houses of my neighbors. But I have to walk a bit to get to them. All in all, not a bad place to hang out. (IMG:style_emoticons/default/sunglasses.gif) |
Dave_Darling |
Jul 10 2017, 03:29 PM
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#16
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Hey, I already made that joke in his intro thread!! --DD |
Mark Henry |
Jul 10 2017, 04:12 PM
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#17
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Nice property...are you a dental floss tycoon? (IMG:style_emoticons/default/biggrin.gif) Thanks. I wish I owned more than 23 acres of that view, but we like it. I live down this road a piece: (IMG:style_emoticons/default/av-943.gif) Okay, maybe not. That photo of my house is kind of a lie because the view blocks out the four houses of my neighbors. But I have to walk a bit to get to them. All in all, not a bad place to hang out. (IMG:style_emoticons/default/sunglasses.gif) Funny our place is also 23 acres, similar but our hills aren't that big. (IMG:style_emoticons/default/thumb3d.gif) Hey, I already made that joke in his intro thread!! --DD Great minds... (IMG:style_emoticons/default/biggrin.gif) |
bbrock |
Jul 10 2017, 05:11 PM
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#18
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Funny our place is also 23 acres, similar but our hills aren't that big. (IMG:style_emoticons/default/thumb3d.gif) Technically, we have 23 and 1/2 acres... but I don't like to brag (IMG:style_emoticons/default/happy11.gif) |
larryM |
Jul 16 2017, 12:52 PM
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#19
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emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California |
check out this thread
https://www.jalopyjournal.com/forum/threads...ng-disc.711982/ i b'ot the sunchaser stuff many yrs ago when he was touring all the big regional car events with his demo today we get 'em cheap fast-&-free and don't have to buy DVDs anymore - the usual competitive encroachments apparently put him out of biz, same as Kelly also see this https://www.google.com/search?num=40&ne...58&dpr=1.25 and http://www.hotrodders.com/forum/tools-harb...ght-168073.html they work |
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