All in one grinder head, Platen, slack and wheels

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JTknives

JTknives

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Jun 11, 2006
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Well its been awhile since i built the first rotating head for my NWG. and i love it to death but after using it for so long i wanted to redesign it a bit. the key issues i wanted to address are these. first a longer platen, my first rotating head only had a 4" platen and now this one has an 8" and maybe you could do a 9". I know this will work on a KMG and KMG clones but I'm not sure about on a NWG. I am in the process of boxing up my NWG as it has a new home it needs to go to. but i can try it out and see for everyone. the next thing i wanted to address was how everything was centered. I wanted to be able to use ether the 8" or 2" wheel as well as the flat platen and not have to change the location of the tool arm very much. well i have it so you only have to move it around an 1" or so for each position. and the last thing was changing its positions. befor it was a nut yo had loosen to rotate it then re tighten it. now the rotating head mounds to a 1.5" dia stud that has a 3/4" spud on the end. this spud fits in a hole on the tooling arm and there is one Allen bolt that locks it into place. the bolt could be replaced with a knob or small handle so no tools would be needed. here is a drawing of the new redesign. it its drawn for using a CNC mill to make it but all the measurements are there. i will do another drawing for people that are just using more simple tools. so here are some pictures to give you an idea what i'm talking about.

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EDIT, sorry.
in the first drawing you see the 5 1/4" bolt holes that bolt the head to the stud. i rotated them 18 deg around the center so that i would have more room on the edge from strength. also the drawing has the contact wheel holes listed as 1/2" but that just means 1/2"-13 taped. so really you need to drill it with like a 27/64 drill i think. sorry for the mix up.
 
Looking good, JT. How about some pic's with it on the new stainless beast you made.


Rick
 
rjudoka said:
Looking good, JT. How about some pic's with it on the new stainless beast you made.


Rick
Click to expand...

It gets mounted today. i need to make the platen and stud-spud post. the platen is set up so it can be removed easily so other platens can be installed, like say a radius's platen :D
 
JT, looks like you are really progressing in your design. Thanks for sharing this with us.
 
I look forward to seeing it mounted. I'll understand it better then. :thumbup:
 
Nice work. If you don't mind, I'll pass along a problem I ran into. Instead of slots, consider tapping the mounting plate and putting the adjustment slots in the brackets that hold the platen. That way the nuts and bolt ends won't hit the tooling arm when you rotate it. I was steered back on track by an experienced maker after I waisted a few hours on my first try.

Sorry if I'm seeing it wrong, Craig

edit to add: looks great JT. You have a ton of extra room there, take care
 
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OK here it is all done. the only thing left to do is heat treat the platen as it is A2 and needs a good 62 RC finish. but as you can see it just looks amazing. It really makes the grinder pop. I am getting a special handle for the tooling arm so i don't need a Allen wrench to change positions. but any way i hope the pictures clear up any questions you might have. i made the slots in the plate longer then i needed because i will be making a platen with a radius on each side, one for like a 2 foot and another for like a 4 foot wheel. but that will come later when i figure out what i really want. but so far i have it set up how i want. i will get the slot cut on the tooling arm maybe tomorrow and try her out. here are the pictures.

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Very nice JT! When will you have one ready for me? No need to get fancy with the stainless. I finally got my new VFD and she's running like a dream. Of course, one of these would make her an awfull lot purdier.

Murph
 
That's an excellent new tool. I could really use something like that!

Nice work!
 
J T
man that is slick! two question if you don't mind
1) How is the spud/stud secured
2) Can the spud be anywhere along the line
of the wheel mounting holes? That would one to have the
platen the same height as the wheels. Your placement
of the spud may be necessitated by how the wheels
swing through the grinder? Not a criticism by any means
just wondering
Tom
So.Ga.
 
Tommegow said:
J T
man that is slick! two question if you don't mind
1) How is the spud/stud secured
2) Can the spud be anywhere along the line
of the wheel mounting holes? That would one to have the
platen the same height as the wheels. Your placement
of the spud may be necessitated by how the wheels
swing through the grinder? Not a criticism by any means
just wondering
Tom
So.Ga.
Click to expand...

in my set up if i put the spud in the middle then the 8" contact wheel would drop below the table and the belt would rub the table. now if you make the platen smaller you could move things around a bit. i just got it all done and mounted to the tooling arm. i will post a picture of it tonight. i'm waiting for a stainless knob for the end of the tooling arm so i just have a 1/2-13 bolt there now.
 
...all of this work and you're still using a 55 gallon drum with a sheet of plywood for a table? Come on, man!
 
That is pretty sweet. Why do you mill the surface instead of surface grinding it?
How thick is that platen, an inch?
 
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