hello to all -- newbie with a couple of questions

M

mike-E

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Mar 2, 2013
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im pretty new at this, only made a few knives so far but im a machinist by trade and im almost done with a home built 2x72((just need a motor)). i saw a video on youtube of a guy who made a surface grinder attachment for his line of grinders. id like to get into making folders and this would be perfect for what i need. does anyone have any experience with this type of set-up? does anyone know where i can get the type of magnet you need to make one.
 
The type of magnet used on surface grinders is unique to surface grinders. I have found one in use machinery sales, or you can order from places link ENCO.
 
If you are looking for the inventor that would be Travis Wuertz, maker of the TW90. Seems like a great grinder and the surface grinder attachment is perfect for a small operation. He is very personable, drop him a line and he can probably point you in the right direction, or better yet buy one of his.
 
im betting from his videos that he's a good guy, thats why i hate to offend him by asking to just sell me the magnet. being a father of 3 on a blue collar budget makes it difficult to afford toys that i could make myself. i also dont think his attatchment would fit my grinder, so i'd have to make/modify his anyway. what im wanting to do is get into making otf knives like jeff harkins, which i know is going to require a permit and a lot of surface grinding.
 
I´m pretty sure I remember Travis saying in the video that he uses rare earth magnets (neodymium) which are the most powerful type. I have a few small ones myself and they are in hole nuther league than the older types of magnets.

Try a google search and I´m sure you can find a supplier.

Brian

Edit: Tried Google myself and found this: www.apexmagnets.com/
 
i could easily machine a fixture to hold bar magnets, but the only ones i can find are magnetized from end to end not side to side like would be required. thanks though
 
I think I know what you mean, but why not use disc magnets? Drill/mill some holes from the backside of your table and insert disc magnets into them. If you have 2 rows with 5 discs in each, I think it should work (provided of course you get the right strenght of the magnets).

Just an idea.

Brian
 
I vaguely recall someone using the a/c compressor clutch from a car.... They're electro magnets or so I think I remember.
 
I actually used to use K&J magnetics, they are a great company and their site is extremely informative. I know get them out of Canada, but I also order them by the thousand (18 per surface grinding attachment). For the individual looking for magnets, I still like K&J.

Here's some hammer in videos from Tim Hancock's grinding class. They're not on my usual Wuertz Machine Works channel cause I was locked out for a while. Brian Land did the editing. He did an awesome job editing the rough hammer in footage. There will be more to come.

https://www.youtube.com/watch?featur...&v=MAgD3bvsY1o
https://www.youtube.com/watch?featur...&v=ChA-WFQbaIs
https://www.youtube.com/watch?featur...&v=pFuVnUA7XLY
https://www.youtube.com/watch?featur...&v=_WflEuxuVdQ
https://www.youtube.com/watch?featur...&v=sHerXl6gaIo
 
travis wuertz said:
I actually used to use K&J magnetics, they are a great company and their site is extremely informative. I know get them out of Canada, but I also order them by the thousand (18 per surface grinding attachment). For the individual looking for magnets, I still like K&J.

Here's some hammer in videos from Tim Hancock's grinding class. They're not on my usual Wuertz Machine Works channel cause I was locked out for a while. Brian Land did the editing. He did an awesome job editing the rough hammer in footage. There will be more to come.

https://www.youtube.com/watch?featur...&v=MAgD3bvsY1o
https://www.youtube.com/watch?featur...&v=ChA-WFQbaIs
https://www.youtube.com/watch?featur...&v=pFuVnUA7XLY
https://www.youtube.com/watch?featur...&v=_WflEuxuVdQ
https://www.youtube.com/watch?featur...&v=sHerXl6gaIo
Click to expand...

Travis, I've got more magnet questions.

The traditional SG magnet is switch on off capable.- but very expensive

I notice you are using fixed super magnets, and it looks like the magnets are the high spots, how do you level them out?
Grinding them would remove the plating and damage them ?

How do you clean all the iron swarf dust so the blade sits flat ?
 
This may be off the wall, but if you had a fixture below the actual surface where the material to be ground would sit and that fixture were hinged in some way it would allow you to attach some sort of lever and give you the mechanical advantage to pull the hinged fixture (to which the magnets would be permanently attached) away from both the surface your part sits on and the part itself. It would be a very rudimentary version of an on/off switch for the magnets and would allow you to clean metal particles off of the surface. Of course you'd have to have magnets strong enough to hold through whatever surface the material to be ground would sit on. It might not be the most practical or easiest method of doing so, but it would likely cost less than a large electromagnet and would solve some of those issues to some degree.

If that doesn't make sense I apologize, it's late and I have a final exam tomorrow and my head is filled with bending moments, stresses, and deflections.
 
I guess these magnets can get pretty fancy ! Rod Nielson was telling me the ones he uses in his disc sander to hold his changable plates on, not only have a power change from where they contact the metal you are grinding on but going less to the back, and as well are needed to be varying and placed in a certain rotation. Not to simple any more. Frank
 
The magnets are actually the low spots, sitting in grooves. The steel table is .060-.080" above the magnets. This allows facing of the table to be "perfectly" true. I might reface a table once a year by marking it with a sharpie and grinding the sharpie off. Refacing only removes about .003" so that means a table should last at least 10 years. I'm typically holding tolerances of .0005" (half a thousanth, according to mittutoyo digital calipers) across the table. I am also very familiar with the tool, but someone new to it should still have little trouble holding a couple thousanths. Belt wear is the main cause of inconsistency.
 
Thanks, that's mostly what I was concerned about.

How do you clean all that grinding dust swarf off the magnet table ?
 
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