Stump Grinder Build

woodlandfarms · Jul 15, 2014

Just got off the phone with my Tractor Manufacturer....

He informs me that my hydrualic circuit has a relief valve built into it so no need for a relief valve across the motor (This assumes that my motor is rated at the full PSI which it is, if I had a 1000PSI motor then I would put a relief valve in).

PapaPerk · Jul 15, 2014

Subscribed. Interesting project. You need to have a good safety plan for when stuff fails. That wheel at 800 rpm will have tons of kinetic energy!

woodlandfarms · Jul 16, 2014

Nope, no safety plan in place other than jump out of the way... It is spinning sideways to me, not that that means anything but I have examined ways of failure and it does not appear it will hit the tractor (well, it would take a lot).

Oh, got my wheel from the machine shop.

PapaPerk · Jul 16, 2014

woodlandfarms said:
Nope, no safety plan in place other than jump out of the way... It is spinning sideways to me, not that that means anything but I have examined ways of failure and it does not appear it will hit the tractor (well, it would take a lot).

Oh, got my wheel from the machine shop.

What steel did you use for cutter wheel? Looks nice.

woodlandfarms · Jul 16, 2014

Just regular soft. I was on the phone with the teeth manufacturer thinking this wheel needed to be 1" thick and blah blah blah. He said "Nope, normal steel, 1/2" is overkill for 35HP"

Again, we will see. I am stealing from other designs so who the heck knows.

tkappeler · Jul 16, 2014

How are you going to balance the wheel of death before running it up to speed? Or is it not necessary?

woodlandfarms · Jul 17, 2014

As I understand it, it you should be pretty close. Some people don't do it at all. I had the guys at the machine shop run it and it was pretty true (they laser cut it and then honed it).

J_J · Jul 17, 2014

woodlandfarms said:
Just got off the phone with my Tractor Manufacturer....

He informs me that my hydrualic circuit has a relief valve built into it so no need for a relief valve across the motor (This assumes that my motor is rated at the full PSI which it is, if I had a 1000PSI motor then I would put a relief valve in).

You might ask Terry this.

Is your PTO relief valve designed to protect the pump or the motor circuit when you shut the solenoid off?

If your PTO valve is a motor spool valve, then no problem.

woodlandfarms · Jul 17, 2014

According to Terry, both. In looking at the control block, there is 2 pressure relief valves and the PTO solenoid.

PapaPerk · Jul 17, 2014

woodlandfarms said:
Just regular soft. I was on the phone with the teeth manufacturer thinking this wheel needed to be 1" thick and blah blah blah. He said "Nope, normal steel, 1/2" is overkill for 35HP"

Again, we will see. I am stealing from other designs so who the heck knows.

It looks like cold roll... Maybe 1045? Doesn't look like hot roll structural steel.