2 X 72 Belt grinder

[wyn]

I've just started having a go at making a belt grinder.
It will use 2"x72" belts and be powered by a 2hp motor.
The pics below show a couple of hours today.

The bits...
- 2 hp 1ph motor
-3 PU wheels
- An assortment of belts
- taper lock pulley
- 6" diameter aluminium.

The idea is to mount it where the clarke grinder/sander is. Fix it to the wall on pivots so it can be folded back when not in use.

Turned down a tube to 24mm to mount the pulley in the lathe

Turned it to get rid of the "sheaves"

Mounted it on the motor. Put a DTI against it and it was pretty good.
The idea now is to turn the aluminium into a flat pulley/wheel which will bolt to the cast iron pulley.

Turning the aluminium to fit the cast pulley.

Testing for fit...seems ok.

I got 6" of aluminium because i thought i would need the extra to hold it when turning.... didn't really think that one through and now need to cut it in half.

I dont know if the old clarke bandsaw will handle it.....still a couple of mm to spare.

That's as far as it got today.

 

[brightspark]

don't forget to put a bit of crown on the pulley

 

[wyn]

I'll look into that.
The one's i've seen have a crown on the tracking wheel.

 

[brightspark]

its very little on the outer edges

 

[wyn]

its very little on the outer edges

I just had a quick read around and you're right.

A bit on the edges should do it.

 

[wyn]

Did a little bit more today.


Made the motor mounting plate.
Plasma cut the hole then a carbide burr to fine tune it.

Plenty of bolt holes...the first lot i got wrong.

I had to do the pulley in 3 cuts and as usual they didn't line up at the end.

It didn't take much with a screwdriver to seperate it.

A bit more turning and the pulley is ok.

Drill and tap a few holes to fix the taper lock/pulley to the aluminium pulley.
I put a DTI against it and got 0.15mm run out....it could be rubbish between the bolted surfaces?
I'll fine tune it when everything else is done.

 

[wyn]

Started on the frame today.
A bit of 50x50 and some 50x25....The 50x25 was to miss the box on the motor.
After doing it i could have used the 50x50 for the bottom rail.

The 2 front rollers are fixed to the box with a 20mm bolt threaded into the box.
Where it threads in i have welded an extra plate to make it a bit thicker.
The bolts are too short at the moment and i can't put a locking nut on.
Also the wheels dont have a spacer between the bearings so it's possible to tighten them too much.

The frame ready to try fixing stuff on.
I welded a temporary stand on it.

The main mistake for today.................The belt doesn't fit over the rollers.......i made the frame too long

Chopped the front off and temporarily tested it to see where it needs welding......need to chop 50mm
off.

Looking a bit better.
Where the hammer is balancing, will probably be the position of the tensioning/tracking roller

 

[brightspark]

are you making a table for it under the grinding belt

 

[wyn]

are you making a table for it under the grinding belt

I think so.
Maybe put it near the bottom front roller.
Also need a plate behind the front bit of the belt to push against.

 

[Exuptoy]

That is a monster @wyn, nice one.

 

[wyn]

That is a monster @wyn, nice one.

It's to replace my clarke grinder/linisher. I use it a lot to sharpen chalk and tungstens.

I think this one might be grinding my fingers down before i know it.

It will be handy to use instead of flap discs and maybe have a bit of a dabble with knives.

 

[slim_boy_fat]

That is a monster @wyn, nice one.

Puts my recently acquired one to shame. But I'd have no room for one that size.

 

[wyn]

Changed the frame a bit and put in some 50x50 box for the bottom rail.

Made up a bit of a "platen"

Spaced it out/Lined it up in the centre of the wheels.
It's only 50mm wide to match the belt.

Held on with two 10mm bolts through a 12mm hole to adjust it a bit.

 

[brightspark]

looking good

 

[wyn]

Cheers brightspark.




Started on the tracking/tensioning roller today.

Made up the tensioning arm.
The pivot is just temporary but will be oilite bushes and a silver steel shaft.
Tensioned with a trampoline spring...room for another one if needed.

Got it wired up and tried it.
I think the front rollers are not "square" as it was a nightmare to try and keep the belt straight. I haven't put a bevel on the tensioning roller yet.
The tensioning arm has a temporary handle welded to the front to pull it down.

 

[brightspark]

have u crowned any of the others

 

[wyn]

have u crowned any of the others

Nothing is crowned. I will probably do the adjuster roller.
I'm pretty sure the front rollers are a bit off.

 

[brightspark]

Nothing is crowned. I will probably do the adjuster roller.
I'm pretty sure the front rollers are a bit off.

no harm in doing both of them its only slight on either side. the one I copied off is twin roller and both are crowned. it may pull right once you have done them

 

[wyn]

This has gone a bit slower than i thought.

The two front rollers were a bit out, so had to fiddle about a bit to get them perpendicular.

Re-did the tracking roller mounting. Not yet using a crowned roller.

Stuck it on the wall using an antileuce clip to hold it in position.....this is a bit rubbish so will probably redo it.

 

[Screwdriver]

Wall mounting is a great idea. I shall be nicking that for mine thanks.