Needs Pictures: 0
Results 1 to 15 of 16
Thread: Alloy faceplate for disc sander
-
9th Jan 2019, 07:27 PM #1Most Valued Member
- Join Date
- Jul 2006
- Location
- Athelstone, SA 5076
- Posts
- 4,255
Alloy faceplate for disc sander
Has anyone made an alloy faceplate around 300mm dia to suit a disc sander.
If so how did you do it.....or would it have been easier to purchase one from H&F as a spare part for one of their sanders?
-
9th Jan 2019, 08:03 PM #2
I made a 270mm Dia. one. It works perfectly well. I made it out on 1/8mm aluminium sheet (cut with a bandsaw). I then used an old aluminium pulley that fitted the motor spindle, put it in the lathe and faced it nice and accruratly. I then bolted the circle with countersing bolts to the now flat face and very gently skimmed the OD while it was still on the lathe, to clean up the bandsaw marks and chamfer it.
I did glue a hook & loop conversion kit to it. Easy as pie to change grit - even mid-job.Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
-
9th Jan 2019, 08:35 PM #3Golden Member
- Join Date
- Apr 2009
- Location
- Ballina N.S.W.
- Posts
- 644
I made this cast aluminium one up many years ago when we had a non ferrous foundry. It was originally 400mm diameter. When I built my belt sander I reduced it down to 300mm. It runs very true.
Bob
-
9th Jan 2019, 09:19 PM #4Philomath in training
- Join Date
- Oct 2011
- Location
- Norwood-ish, Adelaide
- Age
- 59
- Posts
- 6,541
Given that the centre of a sanding disc does (relatively) little work, using say a 15 or 20mm thick slab of Al and bolting that to a steel hub with countersunk screws would probably give an acceptable disc after a skim to true everything up.
Michael
-
9th Jan 2019, 09:59 PM #5
Some of the old 12" LP record players had a platter that was made of aluminium.
There must be a few of them not yet chucked away.
Grahame
-
9th Jan 2019, 10:44 PM #6Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
- Posts
- 2,129
Why not make a steel disc ?
-
9th Jan 2019, 10:55 PM #7
Many were belt drive though and the platter was ultra light weight, often just a piece of 1/32in sheet spun or press formed to roll a rim on the perimeter for the belt to run on. Many were not overly concentric or balanced, and the all ran at 33, 45, 78 RPM, not particularly suitable for running at speeds between 1000 and 4000RPM (allowing for 10 in type sanding disks that fit to table saw arbours in place of blades, a la the Triton one), and can be subjected to a moderate side pressure. Maybe if someone was scrapping Rola broadcast turntables or Panasonic SP10's, with 2+kg balanced platters, the platters might be useful, but most of the Rola's went to scrap in the 70's, and the SP 10's were always fairly rare beasts in broadcast studios let alone outside them.
I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
-
10th Jan 2019, 08:19 AM #8Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,182
I have though of this and then wondered how much higher the startup current would be for a steel disc. I guess it would be higher in proportion to the ratio of the densities of Al and Fe. Might not be too back if the sheet was thin enough.
Somewhere I have a 10mm thick 400 mm Al disc that I was going to turn into a sanding disc but then I picked up a 2m x 150 mm belt with a 300 mm Al disc combo for nothing.
-
10th Jan 2019, 08:34 AM #9Most Valued Member
- Join Date
- Jul 2006
- Location
- Athelstone, SA 5076
- Posts
- 4,255
-
10th Jan 2019, 08:37 AM #10Most Valued Member
- Join Date
- Jul 2006
- Location
- Athelstone, SA 5076
- Posts
- 4,255
[QUOTE=BobL;1945292]I have though of this and then wondered how much higher the startup current would be for a steel disc. I guess it would be higher in proportion to the ratio of the densities of Al and Fe. Might not be too back if the sheet was thin enough.
/QUOTE]
once it gets over the initial thump it shouldnt be a problem
But I will be VFD'ing it anyways.
-
10th Jan 2019, 08:39 AM #11Most Valued Member
- Join Date
- Jul 2006
- Location
- Athelstone, SA 5076
- Posts
- 4,255
Thanks all...that is generally how I thought I'd go about as well...just making sure I wasnt off track
-
10th Jan 2019, 03:16 PM #12Golden Member
- Join Date
- Apr 2018
- Location
- Drouin Vic
- Posts
- 633
I cast this one a few months ago, works a treat. //metalworkforums.com/f303/t202...c-sander-build
-
10th Jan 2019, 04:15 PM #13Golden Member
- Join Date
- Apr 2009
- Location
- Ballina N.S.W.
- Posts
- 644
Hi eskimo,
The original cast aluminium face plate was made by making up a wooden pattern and then using that to produce a sand casting so that it is all one piece. The disc OD was around 410mm and 16mm thick, the boss was 60mm OD and around 75mm long. I machined it to size on a mates 24" lathe. I used at that size for over twenty years. When I made my Belt grinder combination set up I turned it down to a smaller diameter 300mm and reduced the plate thickness and boss size as shown in the picture. I have the belt pulleys for the face plate and the belt sander off set on the frame so the belts can be easily removed,both sets of pulleys are driven by the same 3HP motor.If you intend to make one around 300mm or so in diameter you will need to ensure the plate is fairly stout as you can apply a fair pit of pressure on to OD and you do not want that to flex. Cast Aluminium is
a good choice as it is around one third the weight of steel and makes the motor start up a lot easier.
Bob
-
11th Jan 2019, 12:05 AM #14Golden Member
- Join Date
- Mar 2009
- Location
- Melbourne
- Age
- 54
- Posts
- 825
Every comb and cutter grinder I've ever seen had cast iron or steel disks. They take a bit longer to wind up to speed than a normal bench grinder but when they're going they maintain their speed well under load.
The old Sunbeams seem to come up for sale fairly regularly and with a bit of imagination I reckon you could probably even rig something up to use the pendulum for tool grinding.
If you happen to have a Swiss fetish, check out the ones made by Heiniger.
Cheers,
Greg.
-
11th Jan 2019, 10:13 AM #15Most Valued Member
- Join Date
- Jul 2006
- Location
- Athelstone, SA 5076
- Posts
- 4,255
Similar Threads
-
Disc sander build
By Pete O in forum METALWORK PROJECTSReplies: 10Last Post: 11th Jan 2019, 03:31 PM -
faceplate
By shaper07 in forum THE HERCUS AREAReplies: 3Last Post: 17th Sep 2018, 07:38 PM -
Disc and belt sander
By Maxi77 in forum METALWORK GENERALReplies: 32Last Post: 26th Jun 2015, 10:17 AM -
20 inch Disc Sander
By 4-6-4 in forum METALWORK GENERALReplies: 25Last Post: 8th Jun 2012, 10:04 PM