Pictures of the TW-90 Surface grinder attachment?

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chknifemaker

chknifemaker

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Jun 30, 2013
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I was wondering if someone with the TW-90 grinder surface grinding attachment would be willing to take some pictures of how it's made for me I'm most interested in the slide, how the magnetic table "hinges" and locks for an angle, and how the table was made I just couldn't find any close up pictures of it.....I hope this is okay to ask/post if not just let me know I wasn't sure.
Thanks
 
I wanted to see how he did it so I can make my own version for personal use....I wanted ideas...so I guess reverse engineer. I don't want a replica I have a different idea for it but I wanted to see how he did it
 
I have seen all of his videos(or I wouldn't have asked) but they don't really show the construction of it they just show what it can do and how to use mainly(he does chat a little bit but not enough) but not really what I want.
 
knife to a gunfight said:
It appears that he uses "redi-rail" linear guides for the cross slide.

http://www.pbclinear.com/Redi-Rail-Roller-Bearing-Linear-Guide-Rails
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That's interesting, I always thought he made his roller bearings. Wonder how much that stuff cost? Doubtfully cheap I suppose. I'm a bit surprised no one has taken apart their surface grinder and posted pics of it online yet. With a market cornered by one maker, giving the garage engineers something more to think about might bring the knifemaking community more and cheaper surface grinding attachments.
 
setlab said:
That's interesting, I always thought he made his roller bearings. Wonder how much that stuff cost? Doubtfully cheap I suppose. I'm a bit surprised no one has taken apart their surface grinder and posted pics of it online yet. With a market cornered by one maker, giving the garage engineers something more to think about might bring the knifemaking community more and cheaper surface grinding attachments.
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That's part of my thinking I just haven't found vary many ideas out there and wile i have some of my own and could probably come up with something I would like to see his closer
 
I think there is quite a bit of trial and error involved in this. That will cost you in the end. If you use the trial and error to then produce something like this then great. Then to find someone to engineer something like this to tight tolerances and then to produce the parts. At a much better price. If the price wasn't better by hundreds I would think selling it would be tough. I say we won't see a competitor anytime soon.

I know someone on this site that could produce this but what a project. CNC would be needed to keep costs down.
 
If you don't get any pictures tonight I'll take some pics of mine for you tomorrow.
 
PT Doc said:
I think there is quite a bit of trial and error involved in this. That will cost you in the end. If you use the trial and error to then produce something like this then great. Then to find someone to engineer something like this to tight tolerances and then to produce the parts. At a much better price. If the price wasn't better by hundreds I would think selling it would be tough. I say we won't see a competitor anytime soon.

I know someone on this site that could produce this but what a project. CNC would be needed to keep costs down.
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your probably right but I wasn't planing on selling anything just having the fun and practice of designing a cool tool that is useful maybe making some free plans. Even if someone made some creative and doable plans for the home maker witch isn't for every one but I think it could be done. designing and making something useful is why (at least for me) knives are fun.

If you don't get any pictures tonight I'll take some pics of mine for you tomorrow.
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I'd appreciate that!
Thanks
 
If someone put together a parts list for a solid working version, I think that many would try to tinker one together. That price on the rail that was mentioned above seems really expensive. How many feet for the guesstimated price of $100-150?
 
chknifemaker said:
I have seen all of his videos(or I wouldn't have asked) but they don't really show the construction of it they just show what it can do and how to use mainly(he does chat a little bit but not enough) but not really what I want.
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This man has the brains and balls to come up with this excellent idea and a few of you somehow feel entitled to big detailed pics so you can "Try" to copy it? I suppose you want the blue prints too?

Travis hasn't cornered anything, he's just smarter that you that want to copy it. :thumbed:

And please spare me that this is for the advance of knife making. You're just too cheap to buy one!
 
PT Doc said:
If someone put together a parts list for a solid working version, I think that many would try to tinker one together. That price on the rail that was mentioned above seems really expensive. How many feet for the guesstimated price of $100-150?
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That's just enough to do one unit.

Rail and carriage are sold separately, it's pretty costly
The price I had put it around $300 for one unit.



the next costly item is the magnets, at least $100
 
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Ok, here are a few pics. Good luck. Sometimes it's just better to pony up and buy it. Travis makes nice stuff.































 
i4Marc said:
Ok, here are a few pics. Good luck. Sometimes it's just better to pony up and buy it. Travis makes nice stuff.
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thanks very much.

Those are the best photos I've seen.

I think I had it more or less figured out, but I'm still stuck on the slide ways

How do the two blue aluminum parts stay together and slide ?

If it was a machine tool, I'd say dovetails.

but those pieces are aluminium and dovetails/ gibs are comparatively difficult to do.


And can you give us a rough idea, how wide and long are the blue parts ?

Also how those parts are joined in a way that allows them to slide together.
 
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12345678910 said:
thanks very much.

Those are the best photos I've seen.

I think I had it more or less figured out, but I'm still stuck on the slide ways

How do the two blue aluminum parts stay together and slide ?

If it was a machine tool, I'd say dovetails.

but those pieces are aluminium and dovetails/ gibs are comparatively difficult to do.


And can you give us a rough idea, how wide and long are the blue parts ?
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If I recall correctly, he mentions in one of his vids that he in fact did NOT use dovetailed ways for this application.

If I had a guess, it probably uses some interior milled channels and a guide pin or two.
 
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