jawsjr
starting to shine!
Member since June 2019
Posts: 44
|
Post by jawsjr on Oct 18, 2021 23:18:25 GMT -5
I am working on this Highland Park E50 Grinder Sander Polisher.
I have it completely brown down and the rust has been carefully removed from the shaft. This has a 8" Dia 3" wide thumper wheel. It is secured to the shaft with a hex key set screw. Now of course, I am going to replace this wheel with something better. I would like to have a Nova type wheel on it, but I have not found one that secures to the shaft with a hex key set screw because the wheels are made of plastic. So I am at a loss. I have one idea, but I want to hear what the people who knows a lot more about this stuff than I do would have to say.
|
|
|
Post by Peruano on Oct 19, 2021 5:59:42 GMT -5
If I understand your situation, you have no threads on the end of the shaft that you want to secure the new wheel to. You can buy bushings (flange washers) at Graingers or which have set screws to secure them to the shaft (to place on each side of your new wheel). In order the get it tight enough that your new wheel does not move freely on the shaft you can use a bit of contact cement against the washers, and or drill a hole and install your own set screw in the hub of the wheel. Don't count on the set screw alone to hold the wheel on the shaft though. That takes the two other bushings from Grainger. There may be a better name for them. Edit: I just stumbled across a photo that shows the set screw coller that I used on each side of the wheel that I added to the unthreaded end of the HP arbor shaft. You can't see the set screw in the coller but trust me it is what keeps it in place.
|
|
jawsjr
starting to shine!
Member since June 2019
Posts: 44
|
Post by jawsjr on Oct 19, 2021 7:34:11 GMT -5
What I am running into is the replacement wheel will still spin on the shaft unless there is significant side compression holing it in place. What I see with my other equipment is that the wheels are locked into place with a nut end threads and spacers. I an thinking a trip to a machine shop may be in order, but I want to read other opinions first before I go that route.
|
|
|
Post by Son Of Beach on Oct 19, 2021 7:53:39 GMT -5
You'll either have to size the new wheel correctly...so maybe buy something with a bore that's smaller than your shaft size or like Peruano said you could possibly find some bushings that would make up the difference so it would be a snug fit on the shaft. They have shaft collars that you could put on either side if you have the room to prevent the wheel from moving left or right.
|
|
AzRockGeek
has rocks in the head
Member since September 2016
Posts: 635
|
Post by AzRockGeek on Oct 19, 2021 9:45:58 GMT -5
You could probably put a locking collar on one side and spring with a locking collar on the other side.
|
|
|
Post by knave on Oct 19, 2021 9:59:04 GMT -5
Overthinking it in my opinion. Get one of these: Climax Part 1C-075, Mild Steel, Black Oxide Plating, Clamping Collar, 3/4 inch bore, 1 1/2 inch OD, 1/2 inch Width, 1/4-28 x 5/8" Clamp Screw www.amazon.com/dp/B001VY059A/ref=cm_sw_r_cp_api_glt_fabc_PXNQN6X723TG8ZWB6GN3For your shaft size, snug it barely tight, use a 7/8” wrench to tap it snug to the wheel, then clamp it down.
|
|
|
Post by knave on Oct 19, 2021 10:00:34 GMT -5
Once the wheel is up to speed there is very little torque on the shaft, yes threaded nuts on most but only hand tight on my machines.
|
|
|
Post by parfive on Oct 19, 2021 12:04:43 GMT -5
How about some rubber washers (gasket material) between the locking collars and the wheel? (Same purpose as AzRock’s spring.)
Might need three hands when you tighten the collar but some compression could help secure the wheel enough.
Plan B - Attach a locking collar to the Nova wheel w/pins, screws, epoxy, and/or some whatever. : )
|
|
jawsjr
starting to shine!
Member since June 2019
Posts: 44
|
Post by jawsjr on Oct 19, 2021 21:16:08 GMT -5
Overthinking it in my opinion. Get one of these: Climax Part 1C-075, Mild Steel, Black Oxide Plating, Clamping Collar, 3/4 inch bore, 1 1/2 inch OD, 1/2 inch Width, 1/4-28 x 5/8" Clamp Screw www.amazon.com/dp/B001VY059A/ref=cm_sw_r_cp_api_glt_fabc_PXNQN6X723TG8ZWB6GN3For your shaft size, snug it barely tight, use a 7/8” wrench to tap it snug to the wheel, then clamp it down. That will not work either. The reason is the 1" bore in the wheels are made to slip on to the shaft. This Clamping collar will help from side to side motion, but there is a very high liklihood that the shaft will spin inside the hole. Cannot put enough side pressure on the wheel with these clamps to lock it into place. Smooth shaft inside of a smooth bore, what will happen?
|
|
jawsjr
starting to shine!
Member since June 2019
Posts: 44
|
Post by jawsjr on Oct 19, 2021 21:20:22 GMT -5
I did this same replacement and used an expanding drum with diamond belt. Covington engineering sells a 3” flange with a set screw, I ordered two. Once I tightened down the first one I was able to use clamps to sandwich the drum between the two flanges before tightening the set screw on the second flange. Expanding Drum is different because if its all rubber construction. Since I have a polishing disc on the end, which I intend to keep, with the shields in place, that defeats the purpose of a expando drum. Nova type wheels are of all plastic construction. Take a lot more force to put side pressure on it. Actually considering taking it into a machine shop and have the end turned down and part of it threaded... But that opens another bucket of works, the polishing disc is 7/8 dia, would need to turn that section down as well. Cross that bridge when I get to it.
|
|
|
Post by parfive on Oct 19, 2021 22:32:34 GMT -5
Plan C - File a keyway in the Nova and tap a wedge in when you've positioned the wheel.
|
|
|
Post by knave on Oct 19, 2021 22:46:32 GMT -5
jawsjr It will grind fine in my opinion. Good luck
|
|
Tommy
Administrator
Member since January 2013
Posts: 12,652
|
Post by Tommy on Oct 20, 2021 10:36:09 GMT -5
If this were me I would go straight to Tim's spring idea until proven otherwise not to work. Collar, (rubber gasket?), wheel, spring, collar. Three hands to compress the spring as was mentioned.
|
|
|
Post by knave on Oct 20, 2021 10:49:39 GMT -5
If the collar is smaller than the 1” opening in the wheel you will need washers as well
|
|
|
Post by knave on Dec 14, 2021 10:17:11 GMT -5
I just picked up a lock washer to assist pressure on the wheels I think that will work good.
|
|
NDK
Cave Dweller
Member since January 2009
Posts: 9,440
|
Post by NDK on Dec 15, 2021 16:29:34 GMT -5
I used locking collars on my homemade cabbing machine for quite some time until I had the ends of the shaft drilled & tapped. Did just like Evan suggested. Snug, tap tap, tighten. Worked well and I didn't have a spring, gasket or anything in between the wheel and the collar. They did eventually start to slip, but that was after a long time (years) & it may have slid over a pinch. I never investigated it because that's when I took it in for the permanent fix.
|
|