Belt-sander Linisher
Intro: Belt-sander Linisher
I have a need to sand some concave surfaces. A bobbin sander is too small a radius, I want a big, slow radius, so I've built a rig to turn my belt sander into a concave Linisher and it works rather well!
STEP 1: Make the Curved Platen
Let's start with the curved platen. It's made up of three layers, with the centre layer having an M8 hole and a 9mm gap in it. Set it aside for the glue to cure.
STEP 2: Find a Way of Mounting the Sander
Your sander may well be different to mine, but we have to find a way of holding it securely. Mine has a couple of M6 holes in the side, so I used them. I cut a piece of plywood to fit so that it cleared the dust port and the air vent. This bracket also has a cylinder nut for mounting.
STEP 3: Make the Baseboard
The baseboard is nice and big, about 500x400mm and is held down on the bench with a couple of holdfasts. A notch is chopped into the back edge to take and upright mounting plate. This has a slot routed into it, using the "Dropping-On" technique. I have a YouTube video of that technique if you need it.
The mounting plate is glued in, nice and square.
STEP 4: Mount the Sander
A Bristol lever through the back slot secures the mounting bracket, and thus the sander, to the mounting plate. A small spacer (the green MDF in the photo) lifts the sander off the baseboard to prevent it scouring a groove. I found that out the hard way...
STEP 5: Shape and Mount the Platen
When the glue is fully cured, bandsaw the platen into a curve. Mine is flatter towards one end and rounder towards the other, giving me a range of radii, rather like French Curves. Two M8 nuts are embedded into the underside of the baseboard and the platen is mounted onto a pair of matching studs..
STEP 6: Make the Belt
If you can find a ready-made belt of the required size, then great, but I could not, so I made my own. The abrasive has to go around both rollers of the machine and the platen, with an overlap of, say, 20mm for the glue. The ends were cut at 30 degrees or so. I discovered that the abrasive is in two layers, the mesh itself and the velcro-type backing. The latter can be removed with a combination of thinners and scraping. This makes the joint less bulky.
I used contact adhesive, for its flexibility, and clamped the joint up overnight to let it cure fully.
STEP 7: Let's Go!
The belt must be installed so that the joint trails, rather than leads on the platen, and is tensioned using the adjustment afforded by the slot in the platen. I found that I had to have it quite tight to avoid it stalling. There is not as much traction provided by the drive roller as there would be normally, becuase the belt is in contact for only about 1/3 of the circumference rather than 1/2. So I have to take it easy.
By removing the platen entirely, I can use the setup for flat and convex surfaces too.
Please watch the video and if you have any questions I'll do my best to answer them.
Enjoy!
22 Comments
austin.hall.129794 1 year ago
Rather nifty idea as well, simple but clearly effective, I've got a bunch of belts larger than my current belt sander, so I may well try this :)
Forum has gone downhill a lot, I stick around more for the entertainment value than anything informative.
Hope you're keeping well.
Yonatan24 1 year ago
schreib 1 year ago
Great job Steve; it would be nice to hear these important details.
stevemaskery 1 year ago
schreib 1 year ago
guessing that by celluslose you really meant cellosolve acetate, correct?
Why use that and not MEK or Xylol or whatever?
As to leading the splice. . . not clear. The splice can appear to be "leading" whether it is moving forward on either side of the belt. Wouldn't it be easier to just say copy the arrow direction on the belt and make the 2nd splice parallel to the one that exists?
So, you say you need TWO pieces. How do you "get" two? Do you use two normal size belts, and dissolve / de-construct the splice on each and then make a two new ones the length you desire? Or did you find one really long belt and cut it down allowing the use of only one splice?
Many belts(3M for example) do not have this "velcro" layer. What then?
Do you think the UHU brand contact adhesive is special or would you consider just ANY contact adhesive acceptable? It appears your splice is breaking so I am left wondering if this is the best choice.
stevemaskery 1 year ago
There are no arrows on the sanding material. The exposed edge needs to trail. If it is forward, it only takes the tiniest catch to become history. I had two pieces, rather than a roll. So I had to make two joints. I used what I had availalbe, I'm not suggesting that it is the definitively best way to make your own sanding belts.
Lots of vids on YT.
schreib 1 year ago
Arsted 1 year ago
stevemaskery 1 year ago
oldpunk666 1 year ago
great build though. i LOVE custom jigs and rigs!!!
stevemaskery 1 year ago
socaltoolguy 1 year ago
stevemaskery 1 year ago
stevemaskery 1 year ago
drizztzak 1 year ago
throbscottle 1 year ago
Also today I learnt a new word! Thanks ;)
LarryG7 1 year ago
LarryG7 1 year ago
Second I believe I would choose a belt first and then put the paten where it needed to be. No need to glue a belt together. And I agree with others, it is not easy to glue the ends together and make it hold, especially without creating a bump.
charlessenf-gm 1 year ago
I would join that rank of viewers anxious for details on the construction of your custom belts. Possibly including a link to the manufacturer of the materials you used and the belt material itself. We have Klingspor shops in the USA where one can purchase all manner of abrasive material in bulk as well as packages of material in 'regular' shapes and sizes. Problem is, there are as many different approaches to creating such materials as there are fingers remaining on your hands.
Again, great project! Thanks for sharing!
Then again, why not search your u-tube for:
Homemade Sanding Belts
Make Your Own Sanding Belt
Making your own sanding belt - fast and easy
Make Your Own Sanding Belts
*** Make Your Own Sanding Belt Handmade Creative Channel
HOW TO MAKE STRONG JOINT BELT GRINDER SANDPAPER
sharpstick 1 year ago