Building a jaw crusher

[desert-rat]

I made the jaws out of 1" plate and the sides out of 1/2" it took me two days to build the adapters and cut the eccentric shaft. I don't have a 4 jaw chuck so it took some thinking to make it work in the little lathe. Should have it done before xmas. Today I hit the harbor freight sale and picked up a hammer drill so I can drill blasting holes.

 

[Jim in Idaho]

That looks like a serious crusher, for sure. Going to take some serious HP to turn that. Nice build. Looking forward to some video of that.
Jim

 

[boogeyman]

View attachment 1386127
I made the jaws out of 1" plate and the sides out of 1/2" it took me two days to build the adapters and cut the eccentric shaft. I don't have a 4 jaw chuck so it took some thinking to make it work in the little lathe. Should have it done before xmas. Today I hit the harbor freight sale and picked up a hammer drill so I can drill blasting holes.

If you bought the bigger yellow one not the little red one, open up the cap and pack that puppy full of the included grease. I have done this on the one I have now and it's 4 years old. The other two I had to return seized up within a week. My friend beat the bejeebers out of his and returned it before it seized. I think him walking in with his wrist wrapped in an ace bandage saying "The da**ed thing almost broke my wrist helped.

Just curious. What are you going to use to power your crusher? The rest looks great so far!!

 

[desert-rat]

Im going to try and get it geared down and run it with a 6 HP if that wont do it ill buy whatever I have to have to run it. I know a 22 Hp will if I have to go that big. I really don't see any use in over powering it to the point I cant keep it fed. I wanted to buy a Keene until I priced the materials and realized they are clearing about $8000 on a $9500 crusher. They are super proud of the bearings they use and well they are good bearings because I bought the same thing after talking to the man at Purvis bearings that's what he recommended. The flange bearings were about $75 each. The two main bearings that im using are way over kill and I pulled them out of a gear box off of a oil field pump jack. The weakest point in the drive is going to be where I machined the shaft down from 2 3/8" to 1 1/4". I didn't have enough room to leave a taper on the journals of the shaft. Ill just cross my fingers and hope it doesn't shear there. The bull wheel is a fly wheel off a mack engine that weighs about 120 lbs so I think im good on that end.

 

[Mad Machinist]

On your eccentric, as long as you don't have a sharp corner where the offset meets the bearing journal you should be ok. Ideally on a 1 1/4" shaft subject to a high load you should have about a 1/8" radius there.

So your movable jaw is going to have a 2 1/8" stroke? Gonna take LOTS of power to run that.

Take your desired stroke and divide it in half. That is the amount of offset you need. So if you want a 1/2" stroke, you need a 1/4" offset from the centerline of the bearing journal. When it rotates it will be 1/4" forward of the centerline and 1/4" rearward of the centerline totaling 1/2" of total stroke.

 

[russau]

Ive been wanting to build one of these BUT I have absolutely NO need for one , and my shop ran out of room for anything big years back! Nice build!!

 

[desert-rat]

Well here is the progress on the jaw crusher. My dad finished it up since I left at thanksgiving. Now I just need to make a trip to Texas and pick it up.

 

[desert-rat]

There she is all done up and ready for a coat of paint and some ROCKS!!

 

[itspaidfor]

Super!

View attachment 1392886
There she is all done up and ready for a coat of paint and some ROCKS!!

Great job!

 

[desert-rat]

Here are some pictures of the crusher. The first day my dad got here with it we got some rain so we pulled in the garage and ran it for a few minutes. In the last 5 days I've ran it at least a couple hours a day and haven't had any issues. I've been running everything from the jaw crusher one trip in the flail mill to make it all -50.