New Grinder Attachments at the Bladeshow

well, fiddleback actually said he replaces his wheels every couple months(wow). i think the wear is caused by multiple things. 1. extra pressure(lots more) from the belt. 2. the rubber holding grit between the grooves and acting like sandpaper. 3. if you think of the peaks of the wheels as though they were aluminum threads spinning at 3-4k rippums against an abrasive that gives while they remain rigid you realize that something is going to wear. that will also be an issue with this attachment. ultimately no matter what direction the air is flowing, the fan is going to suck dust inside the housing. you will definitely benefit from a good dust collector if you purchase one.
 
Ok, I can see that with a lot of use. Wear on the crests of the grooves until the belt won't track any longer, anyway.

If it was every couple months for me I would be looking at making wheels with shoulders to constrain the belt rather than the V grooves.
 
JMJones said:
I think the comparison at the end was kind of disingenuous. The bevel ground on the rotary platen is convex, they then ground it on a flat platen to show the scratches, of course there will be a difference because they are two different geometries.

I have honestly never understood the use of platen chillers on flat platens. If they are set up correctly with the belt just barely touching the platen when running, I have never had a platen get anything hotter than warm to the touch and as javland said above almost none of that heat reaches the blade. Radius platens benefit from cooling because there is more friction in that setup.

I also don't understand the use of carbide, when hardened tool steel should hold up fine and can be re flattened many times before it would need to be replaced. I would think that would be a big cost saver.

I do think the jig is pretty slick by being able to grind both sides without removing the blade from the clamp. I think that is the most innovative part of the whole product.
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Maybe if you set up the platen to grind bevels only then you can have the belt barely contact the platen but if you smooth a long blade vertically you need the belt to contact the platen from top to bottom and leave space for the blade not to touch the rollers or contact wheels. I use a Nathan Carothers hardened A-2 platen with a chiller because my platen will get really hot. The temperature in my shop in the summer is always over a hundred degrees as well. Larry
 
kuraki said:
Ok, I can see that with a lot of use. Wear on the crests of the grooves until the belt won't track any longer, anyway.

If it was every couple months for me I would be looking at making wheels with shoulders to constrain the belt rather than the V grooves.
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Or hardened steel.... I've got a chunk of 4140 on the way for a new tracking wheel on my belt grinder. Tired of recrowning the aluminum one
 
LARRYZ10 said:
Maybe if you set up the platen to grind bevels only then you can have the belt barely contact the platen but if you smooth a long blade vertically you need the belt to contact the platen from top to bottom and leave space for the blade not to touch the rollers or contact wheels. I use a Nathan Carothers hardened A-2 platen with a chiller because my platen will get really hot. The temperature in my shop in the summer is always over a hundred degrees as well. Larry
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I profile gyuto blades all the time lengthwise (?? the direction the belt runs) on the platen without issue. If the platen is protruding into the belt there will be significant heat build up but from my experience, it is just not necessary, at all.
 
I have had my rotary platen from Beaumont for at least four years, probably longer, and have never had any issues with having to replace the wheels. However Fiddleback is an actual production shop, where I just mess around making knives when time allows.
 
I saw the video and although it seems to me that the knifemaker that try the sistem is Todd Begg. I think that for any doubt you can ask Moen or even Todd, they are people available to give you information.
 
Been following this attachment for a few months while they were playing around with the prototype. They had me interested until I heard what the price tag was going to be. :eek:

I'm kind of curious what putting a ceramic glass platen behind the long edge of a KMG rotary platen would do?
 
SirSpice said:
The carbide platen provides a low friction and wear resistant backing to the rubber belt so that the bevel is closer to a flat grind. I didn't have an infrared thermometer or a positive materials identification gun, but from what was told it was a fully hardened cts-xhp blade. It didn't have any heat discoloration after he finished, and people were coming up and touching it to see how cool it stayed. It did seem like he was making a point of using a new belt for each demo, and he was running the grinder at half of it's full speed. I did try sliding the jig over the work rest a bit and it was smooth as butter. There's definitely a limit to the length of knife you can grind with this jig, but I'm sure Travis or Jerry or the fine folks at Hardcore Products will happily make you an XL work rest for another $1-2k.

nosaj750, did you happen to pick up an ÜberGrinder? I saw it at the show and it seemed pretty neat. It looked like an aluminum frame KMG with a bunch of TW-90 features. I thought it was interesting that Burr King was adding features that were directly competing with the TW-90 (90 degree flip and surface grinder).
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I got the demo grinder Northridge Tool had and the stand it was on.... Check em out, great grinder for the $$$. New guys on the block and great to deal with... Couldn't be happier with the investment. http://www.northridgetool.com/
 
I like the looks of that platen. I grind with a jig and usually finish at 750 grit. Getting a nice belt finish is not impossible, but it does take me a lot more than 10 minutes.
 
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