Homemade Jaw Crusher.

[David Devuono]

In 2013 I found a clean gravel seam on my land. In 2014 I built a gravel screener to remove the larger rocks (greater than an inch). So a few weeks ago when I found a large cast Iron air compressor flywheel I started thinking about building a rock crusher. Luck would be that I found a second flywheel also marked down at 75% off. So I bought a piece of 1.625 inch Rod and a couple of 1 inch thick chunks of hardened steel. I plan to cut grooves into the plate, run a bead of weld and fashion some teeth. Next on my list is a set of 1 1/2 inch pillow block bearings and see if I can get a set of 2.5 in pillow blocks for a reasonable price. It will take a month to come together if I can stay focused. I am looking at a 4inch x 5 inch wide jaw. Flywheels are 17 inch cast Iron. I am into it for $265 which includes a new 6.5 Hp gas engine and hope to keep it under $500,

 

[Indygunworks]

Good deal.. I cannot for the life of me find a rock crusher capable of handling bricks for less than 1k anywhere, and I am not savy enough to build one myself.

My best hope at the moment is a guy that's supposed to be modifying a chain crusher to work with brick.

I have a HUGE pile I want to turn into rubbish to use for a trail in the wet area of the woods.

 

[David Devuono]

Since the Flywheels are also fans I am not sure how much air they will push at 250 RPM so I will set them up to push dust outwards from the crusher.

 

[David Devuono]

A lot of the Chain crushers I studied are used to powder rock so I would be interested to see one modified to create aggregate.

 

[David Devuono]

Picture of the rock pile. Hope to crush 4" and smaller rocks to 3/4 inch minus for drainage etch on an upcoming retirement home build project.

 

[bcp]

I've often wondered if a larger ball mill could make gravel, instead of powder, on a personal use operation. It might be easier to make than the other types. Sort of like a concrete mixer with holes or screen in the side and balls inside.

Ball mill - Wikipedia, the free encyclopedia

Bruce

 

[Indygunworks]

A lot of the Chain crushers I studied are used to powder rock so I would be interested to see one modified to create aggregate.

Same thing, but with the screen removed from the bottom, possible with 3/4 inch slots welded in. The maker said he would send me a video sometime in the next month or two so we will see.

 

[Renze]

A rock crusher is on my wish list too. Maybe it has to wait till retirement (i am 31 by the way)

Are you going to build a double toggle or a single toggle jaw crusher ?

 

[David Devuono]

Building a single toggle. 4x5inch. Not sure what size plate to use for the lower adjuster (fuse) but will start with 1/4 inch plate. I picked up bearings today for the shaft and cam. 3/8 plate etc so it should start to look like a Jaw crusher by the end of the weekend or so I hope because I have now spent $500.

 

[Renze]

i am very curious about whats its going to be... my ambition is however a 12x20 inch, to be driven by the PTO of at least a 40hp tractor, so it can crush as fast as my 60hp tractor with loader can fill the feeder chute (off course the vibratory grizzly feeder is the next stage, first get the crusher itself to run)

I have bought heavy H beams from a scrapper which i want to weld intertwined so the 15mm flanges together form a sandwich panel with 30mm wall thickness. Its going to cost me some welding wire rolls, and i dont know what i want to use for bearings yet. Its in my head for 5 years now, so someday i'll just start

 

[Baby Grand]

What kind of rock will you be crushing?
Basalt, granite, schist, gneiss, limestone, sandstone, quartzite?

 

[David Devuono]

Hey Renze \I did follow your thread, 12x20 will be a seriously big machine. I know your just doing construction debris but I think you could go quit a bit smaller and build an appropriate feeder.

 

[David Devuono]

Eager to mock up the pieces I have cut so far. Lots of welding on the teeth, ends and much bracing to weld on. Flywheels are 17 inch. Jaws 4x5, bolts are 5/8"

 

[lt190b]

How are you making the offset in the crankshaft to move the jaw?

 

[David Devuono]

What kind of rock will you be crushing?
Basalt, granite, schist, gneiss, limestone, sandstone, quartzite?

I had to buy a book on trees, guess I have to buy one now on rocks. What ever comes off my screening plant in the earlier photo. The rock has been rolled by 5,000 feet of ice so I imagine the rock is pretty hard.

 

[David Devuono]

The shaft is 1 5/8 inch. I am going to weld a 3/8 chunk of steel on one side of the shaft and build up a lobe to match a set of 2 inch inside diameter bearings. I am looking at between 1/2 and 3/4 inch stroke. That is unless I can think of a better way.

 

[Baby Grand]

I had to buy a book on trees, guess I have to buy one now on rocks. What ever comes off my screening plant in the earlier photo. The rock has been rolled by 5,000 feet of ice so I imagine the rock is pretty hard.

Ah - so glacial till. That's the stuff that's left from the mountain that the glacier didn't finish pulverizing. Learn to recognize quartzite and try to wash the stuff before crushing, then pull all the bigger quartzite cobbles you can out of the input stream. It's very hard, tough rock and really has no grain to help initiate fracturing. Anything with a good grain structure should crush up nicely. Looks like you're making the jaws nice and heavy - maybe think about reinforcing the sides with ribs or similar as they may be taking some high wedging forces from the fragments as they break up - maybe not.

 

[Renze]

Looks like you're making the jaws nice and heavy - maybe think about reinforcing the sides with ribs or similar as they may be taking some high wedging forces from the fragments as they break up - maybe not.

A rock crusher operating at 300rpm is a high fatigue machine. 300 strain cycles per minute is 18.000 per hour, is 18 million in 1000 operating hours. Welding reduces the fatigue life quite a bit, so IF you weld in the middle of that jaw plate, it has to be a substantial reinforcement or the fatigue life only decreases...

The fatigue of welded joints is the reason many crushers are cast steel: No welding joints

 

[David Devuono]

The Jaw plates will have weld beads along each ridge and ground into some form of a point. The jaw plates will be bolted to 3/8 reinforced plate so that I can remove them and reweld as required. This is a 110Volt welder project which limits the size of steel I am using. It may work, or it may self destruct with the first rock I put in it. As far as the rock, some of the rock has lines in it looking like tree rings, hopefully that means I will get some good results.

 

[David Devuono]

https://www.youtube.com/watch?v=DlORya3hh04

This machine is quit a bit larger and seems to work good with rebar teeth.