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Surface Grinding Plane Soles - Need a pic please

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Forum topic by JustJoe posted 03-15-2013 02:40 PM 1069 views 0 times favorited 9 replies Add to Favorites Watch
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JustJoe

1554 posts in 727 days


03-15-2013 02:40 PM

I’m at that sweet nexus where my woodworking hobby, metalworking hobby, and old-tool addiction collide. I now own a surface grinder. I’ve got a few off-name junker planes I’ve been saving to play with – I want to use the surface grinder to flatten the sole of the plane, and for the planes that are beefy enough, I then want to grind the sides a perfect 90 to the sole. I found a few threads about people that took it out to be done, but what I need is a pic from someone who is actually doing it themselves because I can’t figure out how to (accurately) secure the plane to the magnetic chuck so that the sole is parallel to the stone. I can do it for a side, but then for the sole I’ve got those @#% curved sides screwing with me.

So can anyone provide a pic of a plane properly secured for grinding the sole on a surface grinder?

Thanks
Joe

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9 replies so far

View rkober's profile

rkober

127 posts in 981 days


#1 posted 03-15-2013 04:16 PM

I’ve thought about it but not done it. There are no machined reference surfaces on the top so I think you’d have to use three or four miniature jacks (and/or two vises) on the rough castings and indicate the bottom to hit with grinder. Then reference from there.

-- Ray - Spokane, WA - “Most people don’t recognize opportunity because it’s usually disguised as hard work.” - Unknown

View Fred Hargis's profile

Fred Hargis

1889 posts in 1182 days


#2 posted 03-15-2013 04:29 PM

I’ve bought a few from another guy (another forum) who does that. Take a look at these pics and see if they help. I have no idea if there are any clues in there, but it won’t hurt to look.

-- Our village hasn't lost it's idiot, he was elected to congress.

View PurpLev's profile

PurpLev

8476 posts in 2337 days


#3 posted 03-15-2013 04:35 PM

grinding vise (pic purpose is to show the vise. in this case on a mill table holding another vise at an angle- different setting):

Use parallels or 1-2-3 blocks on top of the vise jaws to align plant sole parallel to table.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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JustJoe

1554 posts in 727 days


#4 posted 03-15-2013 05:59 PM

Thanks guys.
rkober – you identified the same problem that is bugging me – there’s no easy way to reference off the bed, which becomes the bottom when the plane is flipped over for grinding.

Fred H. – thanks, the only pic was of the plane on its side but that did remind me I have the angle piece to clamp it like that.

PurpLev – I’ve got the grinding vise, thanks. I hadn’t thought of a vise instead of the magnet but it still only gets me halfway there. Problem is going to be shimming/jacking/leveling the plane because it won’t just sit on parallels – there are ribs of different thicknesses running around the edge, the knobs, the frog area etc. The only way to do it – and it sounds like a major PIA for a hobbyist like me – is to make sure the grinder is perfectly leveled, and then put the plane in the vise and use shims and my starrett machinist level to slowly get it perfectly level side/side and front/back.

I’m wondering if I can put it on blocks so it doesn’t touch the table, align it parallel to the table, and then put a cup-wheel on the grinder and go at it from the sides. It will still need careful positioning, but I can do that alignment fairly easy with a gauge.

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View sikrap's profile

sikrap

1036 posts in 2048 days


#5 posted 03-16-2013 03:29 AM

I know a guy that grinds soles/sides. I’ll get hold of him and ask if he’d be willing to send you some pics.

-- Dave, Colonie, NY

View DocBailey's profile

DocBailey

390 posts in 1049 days


#6 posted 03-16-2013 04:31 AM

go here:
http://www.tablesawtom.com/plane.htm
(about half-way down the page)

View unbob's profile

unbob

421 posts in 592 days


#7 posted 03-16-2013 05:01 AM

well,
There are many ways to do it, but, I wouldnt do it as pictured.
Angle plates are needed for sure. My easier way. First, I would determine the best side that relates to the sole. Run a file on the side to remove burrs, determine that a side will rest flat against the angle plate or plates. If it does not, I would shim it with paper strips. This will prevent twisting the casting when clamped. Clamp the side to the angle plate, using a dial indicator, adjust the sole to be flat or true as possible to the grinder wheel head. Using vises on grinder for a job like this one, well, is odd to me, and can induce deflection, and distortion problems on such a thin section casting. Grind the sole first. Then with the sole against the angle plate or plates, and adusted true as possible, grind the side that was started with. Then the last side can be ground without the plates, on the mag chuck.

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JustJoe

1554 posts in 727 days


#8 posted 03-16-2013 10:46 AM

OK guys – thanks, I think I’ve got enough info to give it a shot. The pics and descriptions helped a lot. I’ve got all those height/surface gauge things I’ve collected over the years so now I guess I’ll have to learn to use them correctly. First I need to get the grinder grinding – I got it off the truck last night and onto the driveway – no easy feat because it was on the back of a pickup just about at max lift height for my engine hoist. So now I just need to get it into the garage, cleaned up, put back together, wired, and then moved out to the workshop. The stone that’s on it actually looks like a waterstone (it was being used to polish mirrors when I bought it) so I probably need to order some rougher stones too. I’ll know more when the sun comes up up and I can start working on it.

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View sikrap's profile

sikrap

1036 posts in 2048 days


#9 posted 03-16-2013 03:02 PM

The post by Doc is for the guy I was referring to.

-- Dave, Colonie, NY

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