Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 16 to 26 of 26
Thread: 20 inch Disc Sander
-
3rd June 2012, 05:47 PM #16Senior Member
- Join Date
- Jun 2010
- Location
- Wimmera
- Posts
- 174
I just use a piece of particle board bolted to the face place of my wood lathe. Trued it up once it was on the lathe.
Base was made the same size as the grinding discs used by shearers for sharpening their cutters and combs. (12") They come in a couple of grits. I also use the same glue they use, and when the disc is worn, just peel it off and re glue the new one on. Clamp over-night usually with another circle of particle board and some G cramps.
Available at your local farm supplies.
Have made a base plate that just fits into a tool rest.
Cheers
John.
-
3rd June 2012 05:47 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
3rd June 2012, 06:38 PM #17SENIOR MEMBER
- Join Date
- Mar 2010
- Location
- Nth Qld
- Posts
- 715
I'd been reluctant to use a chisel on an aluminium faced disc, and the guy I gave the sander to, did actually gouge the once accurate but soft face all over with a chisel and it was never the same again. I'd forgot to tell him to just leave the disc face down on a folded rag soaked in turps and the contact cement would turn to a jelly after a day or so and peel off. A bit of clean with a rag and it was ready to go again. It's good that you don't have any curvature problems with your velcro backing, it may be a function of the grit size and type of sandpaper. I also use the disc with zirconia cloth which is not ideal for wood as it tends to clog when old but is also great for deburring/fettling aluminium castings with a bit of stearic acid wax lube. I found as the sandpaper wore out it would start making a very shallow curve on wood as the force required to sand on the disc increased.
I'd heard some foundries had a disc sander large enough that the disc went into the concrete floor, i.e. over 2 metres diameter. They didn't bother having sandpaper on the middle for a large circle as it was too slow to sand effectively. They were large enough that if you had an accident it could kill you if you got wedged between the floor disc and the hole in the floor . The largest one I've seen so far under construction is from memory 36 inches diameter, the disc is off a broken Wadkin and is made from cast iron and balanced, it's been fitted to a tapered roller spindle and frame off an industrial spin drier and when we get around to it an Ebay 15Hp three phase motor via belt drive.
Wimmera jack: I have heard of a 12" aluminium sanding disc face and rim trued up with a sharp wood chisel after fitting to the sander spindle, it took some steel nerves to do.
-
3rd June 2012, 06:48 PM #18
Off topic but there was a post on PM in the antique section about machines in wales (by Asquith, as so many of the interesting ones are) It wasn't a HUGE lathe but it was built in situ and the faceplate went down into the floor so the center height wasn't so far of the ground. Only good for flywheels and other short stuff, but a neat trick all the same.
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
-
3rd June 2012, 09:40 PM #194-6-4
- Join Date
- Mar 2009
- Location
- Melbourne
- Posts
- 295
Disc sander
Dear Simon I commiserate as I also have a to do list. John As Graz sais that to do the wax thing may not be the best idea on an aluminium Disc. I only did it on a steel disc. While I was at RMIT I turned up some 20 inch Cast Aluminum Discs for the teachers who had thiere on home shops This was dome on a Macson lathe in their metal shop.I might add that the chisel cleaning method does need a degree of care. I would hate to have some one using this method to have the chisel leap out and bite some one. Talking about big discs I once saw an article in Fine Wodworker of a place in the states which turned OVAL frames for mirrors and pictures on a wood lathe They were on small either. Thake care 4-6-4
-
3rd June 2012, 09:48 PM #20
I have several of these disks lying around and a grinding unit sitting on top of a big Red Gum post in my implement shed. Flat belt driven. The bearings are very basic. These ones are 14 inch diam. By pure coincidence I made a 14 inch melamine chipboard disk many years ago to fit on my wood lathe the same way. It got a lot of use. Best thing I have seen to dress chainsaw bars.
A friends wife decided to have a cleanup as part of a breakup while my friend was away at work. Most of my lathe was there as he was helping me improve it and it disappeared.
I bought a GMC lathe for $50.00 a couple of years ago and after then finding a decent priced Nova 3000 decided to use the GMC for a sander. The disc would not quite fit. Still deciding what to do for the long run.
Dean
-
6th June 2012, 09:51 AM #21SENIOR MEMBER
- Join Date
- Mar 2010
- Location
- Nth Qld
- Posts
- 715
Here's a photo of the disk sander project I've done some work on, it's not mine unfortunately. It uses one of two cast iron discs salvaged from a destroyed Wadkin disk sander and the four legged frame and spindle bearings off a commercial laundry spin dryer that had recently had new bearings fitted. It'll have inverter drive for the 1440 rpm motor to give a nice slow ramp up to full speed and also for variable speed for different jobs. I didn't measure the disc diameter but if you estimate the spacing of the rings at 2cm against my calibrated thumbnail then it's about 30 inches. I may have to see what he wants for the second balanced iron disc and spindle.
-
6th June 2012, 12:38 PM #224-6-4
- Join Date
- Mar 2009
- Location
- Melbourne
- Posts
- 295
Disc sander
Greetings Chaps. Now Graz that is what I call a Disc Sander. How is the table moved away from the disc to place the sand paper on it. I would have preferred a larger table and once again I would Velcro it if it is to be used on woo. The Velcro sticky base and the 30 inch sanding disks may be a bit of a problem. But If I was in Queensland I would defiantly be interested in the other disc. I saw a n aluminium disc used in na article in Fine Woodworker mad many years ago. This would work if the ally was turned true on the edge. Yours 4-6-4
-
6th June 2012, 09:17 PM #23SENIOR MEMBER
- Join Date
- Mar 2010
- Location
- Nth Qld
- Posts
- 715
Hi 4-6-4, the table has a bolt at each end that allows the table to be removed for changing the paper but glueing it on evenly is going to be fun as the disc can't be removed, a coat of spray adhesive on both surfaces should do the trick if trapped air can be avoided. The sheet aluminium disc on my first sander started at 8mm thick but moved around during machining until it was about 5mm thick after both sides were faced off due to surface stresses. It was better for the motor startup as the low mass spun up a lot faster than my current 12 inch steel disc.
-
6th June 2012, 10:15 PM #24
When I made the 14 inch disk sander I mentioned in post #20 I used 6 inch wide strips of sandpaper stuck on with contact adhesive to the melamine surface. It worked fine. Got to get around to making another one soon.
Dean
-
8th June 2012, 02:23 PM #254-6-4
- Join Date
- Mar 2009
- Location
- Melbourne
- Posts
- 295
Disc sander
Greetings Chaps. Thanks for the comments I was laying in bed the other night ( I do a lot of thinking in the horzontla Position) and for the life of me I could not think of where I obtained my original velcro discs. I have enough to get by on but a few more would not hurt. I have a feeling that my supplier was out Dandenong If anyone knows where to get more I would appreciate it. Yours 4-6-4
-
8th June 2012, 10:04 PM #26
Discs
I am making a 30 inch disc at the moment using a Wadkin disc and a C & H variable speed 2hp motor.Fabricating the frame from heavy angle with a narrow fixed table using taper boards for draft when required.
It is being made as compact as possible to fit next to the Wadkin bobbin I have.
I have a spare disc or 2 one is 32 inch from memory the other a 30 inch Wadkin.
I'll put them in the classifieds when I get back from Canada late July.
H.
Similar Threads
-
20 inch Disc Sander
By 4-6-4 in forum GENERAL & SMALL MACHINERYReplies: 2Last Post: 2nd June 2012, 09:34 PM -
disc sander
By texx in forum WOODTURNING - PEN TURNINGReplies: 5Last Post: 22nd February 2010, 01:02 AM -
Belt sander v disc sander
By groeneaj in forum HAND TOOLS - POWEREDReplies: 3Last Post: 23rd November 2009, 11:47 AM -
Sanding discs for face plate sander/disc sander
By Waldo in forum WOODWORK - GENERALReplies: 2Last Post: 19th April 2005, 05:49 PM