The Woodturning Forum - Woodturner's Resource - Another Dumb Question Withers on the Vine

Jack Hunsucker WR Devotee Offline I am a part of all that I have met. Posts: 342 Gender:	Another Dumb Question Withers on the Vine 05/01/12 at 08:56:11 What are the dangers or reasons not to install 8" wheels on what was purchased as a 6" grinder if there is adequate clearance?
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robo_hippy

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Re: Another Dumb Question Withers on the Vine
Reply #1 - 05/01/12 at 09:17:27

Mostly it would be the issue of putting some thing big on some thing that was designed for some thing small. The motor and bearings are not designed for that kind of over load. Kind of like turning outboard bowls on a mini lathe. You probably could do a few, but if you want to do a lot, you will destroy the lathe.

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JimQuarles WR Administrator WR Patron Offline WR Rocks, BIG Time! Posts: 10839 Gender:	Re: Another Dumb Question Withers on the Vine Reply #2 - 05/01/12 at 09:24:37 The biggest reason is that the wheel guards and the tool platform will not fit. Most 6" grinders have smaller shafts.
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Jack Hunsucker WR Devotee Offline I am a part of all that I have met. Posts: 342 Gender:	Re: Another Dumb Question Withers on the Vine Reply #3 - 05/01/12 at 09:32:52 At least it's not a dumb question any more. I was thinking that the reduced speed might be an advantage.
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Vaughn McMillan

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Re: Another Dumb Question Withers on the Vine
Reply #4 - 05/01/12 at 10:08:56

Jack, I'm pretty sure the speed at the shaft is the same on a 6" or 8" grinder. In most cases, that's 3450 rpm, but some "slow speed" grinders (like the one from Woodcraft) run at 1725 rpm. Keep in mind that for any given rpm, the surface speed (inches per second) on an 8" wheel will be faster than that of a 6" wheel.

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Jack Hunsucker WR Devotee Offline I am a part of all that I have met. Posts: 342 Gender:	Re: Another Dumb Question Withers on the Vine Reply #5 - 05/01/12 at 12:15:48 OOPS! I thought the reverse. Mrs. Miller, please forgive me (my favorite math teacher).
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Robert Harper

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Re: Another Dumb Question Withers on the Vine
Reply #6 - 05/01/12 at 14:02:51

Jack Hunsucker wrote on 05/01/12 at 12:15:48:

OOPS! I thought the reverse. Mrs. Miller, please forgive me (my favorite math teacher).

And why was she your favorite? It looks like you weren't concentrating on the math. Roll Eyes

The big thing I see is that the tool rests and the covers are built for a 6". You might even have an issue with clearance with the table if you take the covers and tool rest off. The motor may, or may not last long but then it gives a good reason to take to the minister of finance why you need to get a new grinder and while you're at it, you should get an 8" grinder to go with the spare disks you've recently purchased.

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Chuck Beland WR Supporter Head WR Twit Offline I got my eyes on you. Posts: 12448 Gender:	Re: Another Dumb Question Withers on the Vine Reply #7 - 05/01/12 at 15:01:33 Jack, Woodcraft has a grinder on sale quite often, it has a 80 & 120 grit white AO wheels perfect for turning tools. I own one & it has worked perfectly & is about $100 or less on sale
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Scott glass

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Re: Another Dumb Question Withers on the Vine
Reply #8 - 05/01/12 at 17:25:02

I have thought about that possibility myself. Since it's hard to say what problems could arise(including possible overloading the motor with heavier wheels) I think it's better to just buy a 8 inch grinder. I have seen what an exploding grinding wheel does and it was not pretty at all. I am glad it was not me with a big gash down half my leg.

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Richard Beversdorf

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Re: Another Dumb Question Withers on the Vine
Reply #9 - 05/01/12 at 17:36:01

Chuck Beland wrote on 05/01/12 at 15:01:33:

Jack, Woodcraft has a grinder on sale quite often, it has a 80 & 120 grit white AO wheels perfect for turning tools. I own one & it has worked perfectly & is about $100 or less on sale

Chuck, if this is the one I'm thinking of it's also used at the John Campbell Folk School for their woodturning classes. I know they get a lot of use---and abuse---there and seem to hold up very well.

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robo_hippy

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Re: Another Dumb Question Withers on the Vine
Reply #10 - 05/01/12 at 21:42:16

Of course, if you have the CBN grinding wheels, there is no need for wheel covers, and no risk of them blowing up ever. Safety instructions with my Baldor grinder said to stand out of the way for a few minutes after starting up the grinder for the first time because the wheels might have been damaged in shipping.

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Scott glass WR Addict Offline Wood is my Gold! Posts: 1589 Gender:	Re: Another Dumb Question Withers on the Vine Reply #11 - 05/02/12 at 04:14:34 I saw those on a grinder recently and have to admit they are a great idea. I would have to look into cost but I would go that way myself. I would think they would last years.
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robo_hippy WR Addict Offline Posts: 1322	Re: Another Dumb Question Withers on the Vine Reply #12 - 05/02/12 at 09:00:54 If you ever give them a spin, you will never use anything else. robo hippy
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Chuck Beland WR Supporter Head WR Twit Offline I got my eyes on you. Posts: 12448 Gender:	Re: Another Dumb Question Withers on the Vine Reply #13 - 05/03/12 at 00:47:59 Richard, I think your right. I think I saw them on a pic of their shop on their web site.
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Richard Beversdorf WR Patron Offline WR Rocks! Posts: 326 Gender:	Re: Another Dumb Question Withers on the Vine Reply #14 - 05/03/12 at 10:07:58 Chuck Beland wrote on 05/03/12 at 00:47:59: Richard, I think your right. I think I saw them on a pic of their shop on their web site. I thought they did a great job at John Campbell. I can tell ya' using it with a Wolverine Jig talked me out of a Tormek system.
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