Home Built Surface Grinder

Ken H> said:
Does it wobble as in "out of round? or not running true? I've had to rebalance a 12" wheel from China. Not a real problem, just spin it to see where it has the heavy spot that always stops at bottom. Remove and drill some metal out there until the wheel doesn't stop at same place.
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Proper way to balance wheel is on special stand KenH not on own bearing they make to much resistance ..... And things go in this order...Spin wheel and mark bottom when wheel stop spinning .Spin it again and see if it stop in same place and mark that place.THEN remove some weight and TURN wheel ONLY 90 degree in one side and watch ..IF wheel TURN back ..... remove some more weight .If wheel continue to spin toward top you remove to much weight....You are done when wheel stop on 90 degrees . . ..
On first picture I balancing my 17 inch wheel ..

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And after that , wheel pass coin test with easy ;)

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Of course I don t remove weight ...I add it on opposite side ....till wheel stop on 90 degress :thumbsup:

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Ken H> said:
Does it wobble as in "out of round? or not running true? I've had to rebalance a 12" wheel from China. Not a real problem, just spin it to see where it has the heavy spot that always stops at bottom. Remove and drill some metal out there until the wheel doesn't stop at same place.
Click to expand...


Oh good tip! It’s hard to tell if it’s out of round as some of the rubber from the molding process throws it off visually. I’ll try what you mentioned and see if it just needs a little better balancing.

What I’m getting is a lot of vibration at about 20-30hz but at 60hz seems to almost smooth out but I can still feel vibration in the grinder and wheel. Above 60 seems to get a touch worse again.
 
Aaaagh! So I need to remove the bearings and use any size shaft? Or does it have to be about the OD of bearing
 
KNelson said:
Oh good tip! It’s hard to tell if it’s out of round as some of the rubber from the molding process throws it off visually. I’ll try what you mentioned and see if it just needs a little better balancing.

What I’m getting is a lot of vibration at about 20-30hz but at 60hz seems to almost smooth out but I can still feel vibration in the grinder and wheel. Above 60 seems to get a touch worse again.
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What is the size of your wheel ?
 
Natlek said:
you need this tool for balancing wheel
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Yep, that's the perfect balancing tool - and what we use to balance wheels on motorcycles. While that will give a MUCH better final balance, you can check balance of your 8" wheel by spinning and see where it stops mounted on grinder. With only 8" diameter it might not show any out of balance even thought it does need balancing.

IF it does stop at same place just mounted on grinder you KNOW it's pretty out of balance.
 
Well it is no big wheel so you can improvise .Look in this drawing ,it is easy to make that and will serve perfectly for balancing that wheel .... you have to level up that two piece of mild steel , that is important/sharpen them on edge like chisel / less friction with axle of wheel/
Look this video clip to understand what you need to do .Only difference will be you take of weight not add .
With my drawing I mind on something like this ...It will work , believe me ;)
view is from top......
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Ken H> said:
Yep, that's the perfect balancing tool - and what we use to balance wheels on motorcycles. While that will give a MUCH better final balance, you can check balance of your 8" wheel by spinning and see where it stops mounted on grinder. With only 8" diameter it might not show any out of balance even thought it does need balancing.

IF it does stop at same place just mounted on grinder you KNOW it's pretty out of balance.
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This is little more then 7 inch contact wheel/heavy/ and balanced ...spin on 40 m/s and pass coin test ;)
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My little monster . . .

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KNelson said:
Yeah good choice as my rear rim has a slight bend haha!
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:)
Go slow ....you don t want to end up with looks like Swiss cheese contact wheel .When you find and mark spot , turn wheel 90 degrees and watch how fast wheel turn back down.Fast means more weight to take of , slow means less weight ... ;)
 
Natlek said:
:)
Go slow ....you don t want to end up with looks like Swiss cheese contact wheel .When you find and mark spot , turn wheel 90 degrees and watch how fast wheel turn back down.Fast means more weight to take of , slow means less weight ... ;)
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Your tips helps greatly! I didn’t have the best jig for the job but I got it where it runs awesome. Not quite Swiss cheese but a lot of material needed to be removed. Gravitational pull must be different in China then here in Maine. No more vibration and now I’m ready to mount up my mag chuck! Thanks again!
 
KNelson said:
Anyone else have an issue with the AliExpress contact wheel wobble? It’s bad enough it shakes my grinder. I can see it was balanced but how good of a job I don’t know. I have it mounted with a 1/2” bolt which is a snug fit and lightly bolted down, bearings are. 12.7mm inside.
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I have a 12" from there. Runs true and steady. Of course my grinder weighs about 130#...
 
Got mine all built and running. Far from the prettiest but so far seems functional! Thanks all for the help and Dave for starting this quest!

Yes mine is vertical mount, originally wanted it at a 45 degree but got lazy. Some things I may change though. I broke the chuck in and ran a test piece last night and was far from happy. Read through this thread again and found I was taking too much material at a time. I broke the chuck in again very lightly and tested a chef knife blank and the finding were impressive for myself haha. I took very light passes with about 10 strokes before taking more material. Micrometer readings are within .001-.0015 untill I get to the end of the handle where the last inch is about .0025 thinner than the rest. Most of my readings were .095-.096 and the handle end was at .093. Not sure if this will create a gap under the scales? Or give me issues with handle separation? Will have to try..



Here she is, chef blank is a fresh 120 ceramic finish
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David (AKA "OneArmed") - just look what you started. This thread is 26 pages with over 500 posts and a goodly number of SGAs have been built as a result. Thank you for starting the thread.

Ken H>
 
Agreed, a few more folks are in the works on theirs as well! So thank you again couldn’t be happier.

Also does anyone know OneArmed’s knife name? I confused him with evader knives
 
Ken H> said:
David (AKA "OneArmed") - just look what you started. This thread is 26 pages with over 500 posts and a goodly number of SGAs have been built as a result. Thank you for starting the thread.

Ken H>
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Unfortunately, David was kicked off the forum. He reached out via a Youtube comment on my surface grinding video. Very unfortunate to have someone like him not allowed on this forum anymore. No wonder guys talk poorly about this place and the moderation.

Edit: He left another comment and said he left the forum. He wasn't kicked off. View the youtube video to read the comments. Maybe message him to reach out.
 
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