425 Stump Grinder versus Trencher

[ddonnell]

Am I right that some sort of buzz saw won't work either because of RPM limits? I don't see anything like that in Power Trac's attachment list.

 

[BobRip]

You can get a hydraulic power chain saw, but not from PT and they are quite expensive. When cutting up a tree I quite often use the PT to lift the tree. This is extremely helpful.

 

[Gravy]

I don't see why a buzz saw conversion wouldn't work. Adapt a heavy-duty circular saw blade to the stump grinder. According to calculations, my stump grinder runs at about 660 rpm. I'd want to look up specs to be sure, but that seems like it should be a reasonable speed for a saw blade of similar diameter.

The biggest problems I see are the limited depth of cut, and keeping the blade sharp enough.

Gravy

 

[BobRip]

I don't see why a buzz saw conversion wouldn't work. Adapt a heavy-duty circular saw blade to the stump grinder. According to calculations, my stump grinder runs at about 660 rpm. I'd want to look up specs to be sure, but that seems like it should be a reasonable speed for a saw blade of similar diameter.

The biggest problems I see are the limited depth of cut, and keeping the blade sharp enough.

Gravy

If you are going to change the blade and the blade had enough speed, it would work. The 2 inch wide blade takes way too much power, a 1/8 inch would not. My radial arm saw runs around 3450 RPM. I have a large blade for a cutoff saw that is rate for 5000 RPM max. Is there a blade of the same diameter as the stump grinder that will cut fast enough if run at 660?

 

[J_J]

If you are going to change the blade and the blade had enough speed, it would work. The 2 inch wide blade takes way too much power, a 1/8 inch would not. My radial arm saw runs around 3450 RPM. I have a large blade for a cutoff saw that is rate for 5000 RPM max. Is there a blade of the same diameter as the stump grinder that will cut fast enough if run at 660?

Bob, I have an early 90's trencher/stump grinder with non replaceable teeth. It digs a nice trench, and chews up stumps equally. You don't have to be that fast, but must have sharp teeth. The blade can not be reversed. It is built on to the tapered shaft. I would rather have the bolt on blade, and bolt on teeth.

 

[BobRip]

Bob, I have an early 90's trencher/stump grinder with non replaceable teeth. It digs a nice trench, and chews up stumps equally. You don't have to be that fast, but must have sharp teeth. The blade can not be reversed. It is built on to the tapered shaft. I would rather have the bolt on blade, and bolt on teeth.

I have the same or similar unit. I don't think the present blade needs to be fast, but if you put a wood cutting blade on wouldn't if have to be reasonably fast? My experience with wood cutting circular blades comes from table saws and radial arm saws. Larger ones may be different.

 

[J_J]

I have the same or similar unit. I don't think the present blade needs to be fast, but if you put a wood cutting blade on wouldn't if have to be reasonably fast? My experience with wood cutting circular blades comes from table saws and radial arm saws. Larger ones may be different.

A larger blade with the same rpm, will give an increase in velocity, or tip speed, or feet per second or MPH

I guess the situation would have to depend on the power applied and rpm.

My stump grinder takes 3/4 in swipes every time it contacts the wood. A thinner blade at higher rpm, with 1/4 in teeth might do just as well.

 

[BobRip]

A larger blade with the same rpm, will give an increase in velocity, or tip speed, or feet per second or MPH

I guess the situation would have to depend on the power applied and rpm.

My stump grinder takes 3/4 in swipes every time it contacts the wood. A thinner blade at higher rpm, with 1/4 in teeth might do just as well.

J_J, my stump grinder cuts a 1.5 inch swipe. I wonder if they changed it. Mine was built around 2000. I have always felt it cut too wide for the power available. You have to cut very slowly and really be right on the edge of stall for maximum cut rate.

I understand about the speed, that's what really affects the cut rate. My blade cannot be changed easily or I would give this a try.

 

[J_J]

J_J, my stump grinder cuts a 1.5 inch swipe. I wonder if they changed it. Mine was built around 2000. I have always felt it cut too wide for the power available. You have to cut very slowly and really be right on the edge of stall for maximum cut rate.

I understand about the speed, that's what really affects the cut rate. My blade cannot be changed easily or I would give this a try.

Bob, I really don't know if they changed , or when. They may have tried to get one device to do two different things.