Question on my grinder build (Almost done)

JawJacker

Well-Known Member
I looked at McMaster Carr for the 40lb gas strut-shock. I cant figure what one you guys are using, looks confusing dont want to order the wrong one. David
 

JawJacker

Well-Known Member
OK think I have it figured out, Im reading some of you are using 60lb in stead of 40lb any advice?? on this would be great.
 

EdCaffreyMS

"The Montana Bladesmith"
Just a bit of advice when mounting a gas strut on a grinder..... mount it with the rod portion/seal facing downward. A couple of years ago I had three of them fail on me within two months.... I finally figured out that all the steel dust/grit of grinding was getting to the to seal and destroying it (at the time I was mounting them with the rod/seal facing up). When I mounted them with the rod/seal facing down, it took almost a year before the seal went, and it failed.

I've since gone back to the typical spring..... never had one of those fail. :)
 

JawJacker

Well-Known Member
Ed, as I was reading your post I though, I wonder if a large wire shrink wrap would work just cut it long and heat the 2 ends to seal them. just a though.

Is the best place for a spring Mcmaster what poundage??

NCbiker, do you have many belts break @60lbs. I also have it setup to wet grind wondering how that will affect belt life @ 60lbs

Thanks David
 

scott.livesey

Dealer - Purveyor
not sure which grinder you are building. I have a Wilmont LB1000 with an adjustable tooling arm that has 2 small wheels with the platen in between. by moving the tooling arm, I can adjust for any belt tension I want regardless of the spring rating.
 

JawJacker

Well-Known Member
Scott, Im not a metal guy, I have taken a few ideas from different grinders out there Im further along than the pic. The idea I have is KMG, tag 101 style for the tension arm, rear pulling spring or top shock or spring may just do a spring.From reading I see most tracking problems are solved with heavy tension. Question is how much?2.jpg
 

NC Biker

Active Member
NCbiker, do you have many belts break @60lbs. I also have it setup to wet grind wondering how that will affect belt life @ 60lbs

Thanks David

I've been running with 60# for over a year and never had a belt break. I also run wet when I'm grinding post HT, again no problems.
 

EdCaffreyMS

"The Montana Bladesmith"
Ed, as I was reading your post I though, I wonder if a large wire shrink wrap would work just cut it long and heat the 2 ends to seal them. just a though.

Is the best place for a spring Mcmaster what poundage??

Got back to the thread a bit late!.... Ya know, I think if a guy could rig up some type of "boot" or "protector" for the exposed rod/seal, that just might be the answer..... I'd not thought about doing that! That might just be a reason to give the struts another chance in my shop! :)

It might make you laugh.... but all the springs on my grinders came from the local Ace Hardware store. I used the original springs as a reference. I had no idea what the poundage was, so I just visually picked the springs I'm using based on the wire diameter, spring diameter, and overall length... and picked springs that looked a bit "heavier".
 

JawJacker

Well-Known Member
Little more done, Im on the tracking arm and wheel now.IMG_1179.jpgIMG_1180.jpgIMG_1181.jpg
I dont have a VFD setup yet, so the plan is use this 1'' wheel and the 4'' drive wheel as needed.
 
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Navin_R_Johnson

Active Member
The weight of your spring will depend on how far from the pivot it's mounted. Just like a longer wrench will give you better torque because your hand is farther from the pivot.
Compare that pivot/sprig distance to a few known designs and you should be able to get a good guess for a spring weight.
 

JawJacker

Well-Known Member
All that 1/2 in. has to have me around 150 lbs so far plus I need a 16x22'' bottom mount plate and the tracking arm. Im changing the work rest to cold rolled 1/2x4x13. I do like how tall I have it set Im 6'3 keeps my neck and back straight.

Boy, that's one study looking machine well done.
Frank
 

mcreskar

Member
I used a 40# on a grinder that I built for a friend and he said that it could be a little stronger so im going to put a 60# spring on mine. You have take the weight of the tracking arm into consideration also. Nice grinder btw.


Mack
 

JawJacker

Well-Known Member
Im getting closer,1z1 (1).jpg1z1 (2).jpg1z1 (3).jpg1z1 (4).jpg1z1 (5).jpg1z1 (6).jpg1z1 (7).jpg1z1 (8).jpg little more done as I said, I get very little time to play. The time I took to make sure the wheels centered each other I hope pays off.
I ordered some belts I still may go with the shock not sure yet.
 

JawJacker

Well-Known Member
95% done
Tracks well, belt is tight doesn't wander with pressure I took the platen off gluing the glass on now. Tension spring is just sitting in there (for now) think Im going with a shock. This thing is freakin heavy, smooth and relatively low noise. Its going on a low cart. I should be wrapping this up soon, Ive been busy as hell lately I started this I think it was Oct. well worth the wait. Just want to thank everyone for the info and advise I received here. I hope the posts help someone down the line. I think if you can cut weld and drill, these grinders are relatively simple to make.


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Self Made Knives

Well-Known Member
Looks great! I see elements of other designs incorporated all into one, obvious you researched this a lot. How about a video tour when you get it all wrapped up?
 
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