Affording good sharpening stones
#77
  Re: Affording good sharpening stones by Robin Dobbie (How do you do it? I ...)
Timberwolf,
Thanks for posting the link to the laps.  I will have to check those out!
Steve
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#78
  Re: Affording good sharpening stones by Robin Dobbie (How do you do it? I ...)
(01-15-2020, 02:19 PM)Timberwolf Wrote: ............
Knife making is why I built it..I enjoy carving and working with exotic woods and metals and needed small, a slo-speed machine and there wasn't much to choose from in that regard.

Those guys look like they're up to something!

Is that motor hooked up to a VFD? Looks direct drive.

(01-15-2020, 06:53 PM)arnman Wrote: I always wondered if "0.005 across the surface" was a typo on their part.  That seems like a fairly big gap under a straight edge on a relatively small surface.  I can easily see light under a straightedge that is too big for my 0.0015 inch feeler gage.

Yeah you're right, that's actually one less zero than I would think it should be. Maybe they're just covering their tooter.
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#79
  Re: RE: Affording good sharpening stones by Robin Dobbie ([quote='Timberwolf' ...)
(01-16-2020, 06:01 PM)Robin Dobbie Wrote: Those guys look like they're up to something!

Is that motor hooked up to a VFD? Looks direct drive.


Yeah you're right, that's actually one less zero than I would think it should be. Maybe they're just covering their tooter.

...................
Is that motor hooked up to a VFD? Looks direct drive.

No VFD...belt runs about 1,000FPM..Motor speed is 1725RPM. Drive wheel is about 1 3/4" or /2" diameter IIRC.
I love the Corps for those intangible possessions that cannot be
issued: pride, honor, integrity, and being able to carry on the
traditions for generations of warriors past. [Cpl. Jeff Sornij, USMC;
in Navy Times, November 1994]


Jack Edgar, Sgt. USMC Korean War 51/52
Get off my lawn ! Upset





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#80
  Re: RE: Affording good sharpening stones by Robin Dobbie ([quote='Timberwolf' ...)
(01-16-2020, 06:01 PM)Robin Dobbie Wrote: Those guys look like they're up to something!

Is that motor hooked up to a VFD? Looks direct drive.


Yeah you're right, that's actually one less zero than I would think it should be. Maybe they're just covering their tooter.

Sorry Robin, I meant to say the gap is too small for my feeler gage.  But it looks like you knew what I meant!

I went back and edited my post.
Steve
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#81
  Re: Affording good sharpening stones by Robin Dobbie (How do you do it? I ...)
(01-16-2020, 09:01 PM)Timberwolf Wrote: ...................
Is that motor hooked up to a VFD? Looks direct drive.

No VFD...belt runs about 1,000FPM..Motor speed is 1725RPM. Drive wheel is about 1 3/4" or /2" diameter IIRC.

So, slow speed is just relative to like a 13-15k RPM angle grinder? To me, that's still screaming compared to water stones, tormek-style, or even the 580 RPM worksharp 3000. Accoring to an overly-enthusiastic carpenter review of the work sharp, they recommend a 1-2 second burst before letting the workpiece cool. I thought that was the name of the game with 1725 or 3250 RPM grinders. Then again, I think the previous Work Sharp was indeed 1700-something RPM, but I'm too lazy to look at their manual. 

(01-17-2020, 12:00 AM)arnman Wrote: Sorry Robin, I meant to say the gap is too small for my feeler gage.  But it looks like you knew what I meant!

I went back and edited my post.

.005 is too small for a .0015 gauge? I wasn't confused but now I am. Regardless, if woodworkers can flatten the soles of the planes with a piece, or several pieces of sandpaper on a $5 floor tile such that they can't get under it with a .0015 gauge, you'd think Veritas could promise a little better than that in a factory setting.

I was looking at things that had nothing to do with woodworking on the sharpening supplies site and noticed some giant machines with discs/plates that are meant for sharpening clipper blades en masse. A 16" plate is advertised as being able to sharpen 1000 blades per side. Scaled down to the size of typical lapping plates, that's not a lot, in my mind. I suppose they're more geared for speed, as the loose grit they're supplied with is 220 I think. But still.
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#82
  Re: RE: Affording good sharpening stones by Robin Dobbie ([quote='Timberwolf' ...)
(01-17-2020, 04:00 PM)Robin Dobbie Wrote: So, slow speed is just relative to like a 13-15k RPM angle grinder? To me, that's still screaming compared to water stones, tormek-style, or even the 580 RPM worksharp 3000. Accoring to an overly-enthusiastic carpenter review of the work sharp, they recommend a 1-2 second burst before letting the workpiece cool. I thought that was the name of the game with 1725 or 3250 RPM grinders. Then again, I think the previous Work Sharp was indeed 1700-something RPM, but I'm too lazy to look at their manual. 


.005 is too small for a .0015 gauge? I wasn't confused but now I am. Regardless, if woodworkers can flatten the soles of the planes with a piece, or several pieces of sandpaper on a $5 floor tile such that they can't get under it with a .0015 gauge, you'd think Veritas could promise a little better than that in a factory setting.

I was looking at things that had nothing to do with woodworking on the sharpening supplies site and noticed some giant machines with discs/plates that are meant for sharpening clipper blades en masse. A 16" plate is advertised as being able to sharpen 1000 blades per side. Scaled down to the size of typical lapping plates, that's not a lot, in my mind. I suppose they're more geared for speed, as the loose grit they're supplied with is 220 I think. But still.

..............................
that's still screaming compared to water stones, tormek-style, or even the 580 RPM worksharp 3000.

Yes it is when compared to the "ultra" slow speed units, but about a third of the speed most belt grinders run at. But even the machines you mentioned are faster than honing on waterstones or other stationary hones..But with belts you can take steel from raw stock to a straight razor and then use it to make the handles. You can get sharp edges on a hone, but IMO you can't get that same edge nearly as FAST..Speed is the beauty of it...A side benefit is the fact that, as fast as it is, you have to try really hard to get the steel so hot that the temper is lost.

I was at a woodcarving show last fall and they had three Viel { Lee Valley } belt grinders set up to sharpen carving knives for the crowd who couldn't sharpen their own...Three bucks each for less than two minutes stropping. Big Grin
I love the Corps for those intangible possessions that cannot be
issued: pride, honor, integrity, and being able to carry on the
traditions for generations of warriors past. [Cpl. Jeff Sornij, USMC;
in Navy Times, November 1994]


Jack Edgar, Sgt. USMC Korean War 51/52
Get off my lawn ! Upset





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