All MetalShaping

Go Back   All MetalShaping > General Metal Shaping Discussion > General Discussion
  Today's Posts Posts for Last 7 Days Posts for Last 14 Days  

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-30-2019, 06:56 PM
rkolenda rkolenda is offline
MetalShaper of the Month Nov. 2009
 
Join Date: May 2009
Location: Rockford,Michigan
Posts: 93
Default shrinking with wood disc

I started to use these wooden disc with my 4.5 inch grinder a couple of years ago on aluminum panels to shrink without damage.I was not happy with the galling left when using a stainless steel disc.It worked well and I am now using wood to shrink steel as it produces plenty of heat.The disc is made of hardwood.I use maple but other hardwoods should work.No softwoods. Due to the high rpm of these 4.5 inch grinders I won't go any larger than 4.5 inch disc diameter.The first discs where made on a lathe and took to long to make so I decided to try to make one as simply as possible using common tools that most of us have access to.IMG_1396.jpg. The tools needed are a 4.5 inch hole saw and arbor. A 5/8ths ,7/8ths and 1-1/4 forstner bits.A 1/4 inch piece of drill rod.You will also need access to a drill press and a couple of clamps to keep things from moving out of alignment.
IMG_1375.jpg First pick out a piece of hardwood and inspect it to make sure that there are no splits or knots. Cut out the disc using the 4.5 hole saw afterwards the 1/4 inch pilot hole left from the arbor will be used to line up the disc for the next operation.

IMG_1377.jpgSwitch the hole saw for the 1/4 drill drill rod (a 1/4 inch drill bit would work also)to center and align the disc then clamp it to the drill press table.

IMG_1378.jpgNow switch to the 1-1/4 forstner bit and drill the pocket to a depth of 7/16 inch.

IMG_1380.jpg Measuring pocket depth

IMG_1382.jpgNow switch to the 5/8ths bit and bore the spindle hole thru

IMG_1393.jpg. My DeWalt grinder uses an adapter with a small shoulder that we will need to allow for.Your grinder may be the same.

IMG_1389.jpgThis is the shoulder I was referring to.

IMG_1386.jpgLeave the 5/8ths bit to line up the center bore after flipping the disc then clamp it down

IMG_1387.jpgSwitch to the 7/8ths bit and counterbore the backside of the disc just enough to allow your adapter to fit flush.
__________________
Robert
Reply With Quote
  #2  
Old 05-30-2019, 07:09 PM
rkolenda rkolenda is offline
MetalShaper of the Month Nov. 2009
 
Join Date: May 2009
Location: Rockford,Michigan
Posts: 93
Default part 2

IMG_1388.jpgAdapter now fits flush

IMG_1342.jpgI cut a 5/8 x 11 nut in haft because the standard nut is too thick. Thinner nuts are available thru supplies like McMasterr Carr and others but I didn't think I needed a quantity of 25 at the time.

IMG_1346.jpgNow I have 2

IMG_1391.jpgMounted to the grinder it is not quite ready yet

IMG_1398.jpg I first like to break it in by maying a few passes on a piece of clean steel plate to start the bevel

IMG_1399.jpg A side view of the bevel.
__________________
Robert
Reply With Quote
  #3  
Old 05-30-2019, 07:37 PM
rkolenda rkolenda is offline
MetalShaper of the Month Nov. 2009
 
Join Date: May 2009
Location: Rockford,Michigan
Posts: 93
Default A demo

IMG_1400.jpg A piece of scrap .063 thick 3003 aluminum pulled from the bin.

IMG_1403.jpg A straight edge shows the crown

IMG_1401.jpg Here is a before photo of the surface

IMG_1404.jpgI use a mixture of water with a bit of dawn disc soap to cool the panel after shrinking.It also cleans the residue left from the disc.

IMG_1406.jpgI did not have someone to take a photo of me using the disc but it is used dry NO Lubrication . After using the shrinking disc .I cool the panel using a chip brush. The steam rising doesn't show in this photo.After checking progress on the panel I wipe it dry before the next round of shrinking.NO LUBE.


IMG_1409.jpgSince this was just a scrap piece used for this demo I over shrunk it a bit .If it was an actual panel I would have been more careful .

IMG_1411.jpgHere is the same surface after the shrinking disc.No damage after shrinking all the crown out.
__________________
Robert
Reply With Quote
  #4  
Old 05-30-2019, 08:02 PM
Kerry Pinkerton's Avatar
Kerry Pinkerton Kerry Pinkerton is offline
Administrator
 
Join Date: May 2009
Location: Near Huntsville, Alabama. Just south of the Tennessee line off I65
Posts: 8,144
Default

EXCEPTIONALLY good tip Robert. I'll be making one for sure!
__________________
Kerry Pinkerton
Reply With Quote
  #5  
Old 05-30-2019, 08:30 PM
cliffrod cliffrod is offline
MetalShaper of the Month January 2020, March 2022
 
Join Date: Dec 2014
Location: Spartanburg, SC
Posts: 2,707
Default

Very cool, Rob. Thanks for sharing. I just got a hole saw about that big. Looks like I'll be putting it to use for some new tooling asap...

Is your grinder variable or single speed?
__________________
AC Button II
http://CarolinaSculptureStudio.com
https://www.youtube.com/channel/UCzSYaYdis55gE-vqifzjA6A Carolina Sculpture Studio Channel
Reply With Quote
  #6  
Old 05-30-2019, 09:17 PM
BTromblay BTromblay is offline
MetalShaper of the Month August 2018
 
Join Date: Oct 2015
Location: Mukwonago, Wi
Posts: 467
Default

Hi,

Bob had shown me the wood shrink disk a while back for aluminum and I haven't used my stainless disk since. Works very well in a 4 inch grinder. The left over black char on the surface comes off easy with water and a scotch bite pad, will try the dish soap trick.

Thanks for sharing,

Bill
__________________
Bill Tromblay

"A sign of a good machinist, is one who can fix his F$@& Ups" My mentor and friend, Gil Zietz Micro Metric Machine.
Reply With Quote
  #7  
Old 05-30-2019, 09:47 PM
rkolenda rkolenda is offline
MetalShaper of the Month Nov. 2009
 
Join Date: May 2009
Location: Rockford,Michigan
Posts: 93
Default

"Is your grinder variable or single speed?"Hey Clint ,I use a single speed grinder.The 5/8 x 11 spindle size seems to be quite a common size but it should be easy enough for the guys worldwide to change up for their needs.
__________________
Robert

Last edited by rkolenda; 05-30-2019 at 09:51 PM.
Reply With Quote
  #8  
Old 05-31-2019, 12:24 AM
Jaroslav Jaroslav is offline
MetalShaper of the Month April 2020, September 2021
 
Join Date: Dec 2012
Location: Czech Republic
Posts: 1,937
Default

Robert. Good idea, I'll must remember. But I'll use a lathe.
__________________
Jaroslav
Reply With Quote
  #9  
Old 05-31-2019, 05:27 AM
Gojeep's Avatar
Gojeep Gojeep is offline
MetalShaper of the Month March 2015, March 2020,, June 2022
 
Join Date: Nov 2013
Location: Eastern Melbourne, Australia
Posts: 2,684
Default

Thanks for showing this.
__________________
Marcus
aka. Gojeep
Victoria, Australia
http://willyshotrod.com

Invention is a combination of brains and materials.
The more brains you use, the less materials you need.
Reply With Quote
  #10  
Old 05-31-2019, 06:05 AM
RockHillWill RockHillWill is offline
MetalShaper of the Month Jan 2019
 
Join Date: Oct 2009
Posts: 3,088
Default

Bob was kind enough to make one of these for me a while back. It works extremely well. So well, that I loaned it to some one who must love it! Thanks for posting all the pictures.
__________________
Will
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 11:49 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.