Reddog
TreeHouser
I had asked some questions in another thread and Ed L, Mangus and Holmen Tree where very helpful in showing me some options. Thank you.
So here is what I did, if it helps some one else good.
First you need some sort of stud adapter, you could purchase or make your own.
Here is what I made using simple shop tools.
I ordered a 10 pack of .5 dia with a .250 thru hole 3/16 thick aluminum spacer from Mcmaster Carr Part# 92510A761.
Put 4 of them on a 1/4 bolt and tighten. Place in a drill press and then us a file to reduce the outside dia. to .470
Take a block of wood of plastic and drill a 1/2 hole through, then cut a slot so it will squeeze down when clamped.
Place a bushing in the hole clamp down and then drill the center out using an 11/32 drill. It will drill enough oversized to fit the 9mm stud.
Now the bar is 3/16 thick so you will need to reduce the thickness a few thousands. I just place the bushing over a screw head in the bench and take a couple swipes on each side with the file. Debur and your bushings are complete. A not about filing aluminum, it likes to gum up files use WD-40 or kerosene on your file to keep it from sticking. And a wire brush or file card help to clean out the teeth.
Now on to the Bar modifications.
First thing I did was to chamfer the oil holes using a die grinder and 1/8 carbide burr, as the Stihl holes are half a hole dia higher on the bar.
Next place layout lines to show 1/2 longer slot towards the nose end.
Then using a .045 cutoff wheel in my 4 1/2" grinder, I held tight to the sides and moved forward.
Then flip the bar over and finish the slots from the other side.
Then remove the material in the middle.
Use a file to debur.
Now you need to decide if you want to grind down the tensioning pin or drill out the hardened bar to 1/4" clearance. I chose to remove and grind down the pin on the bench grinder to fit the .230 dia hole.
Here is how it looks mounted.
I picked 1/2" because on all the bars I tried 16", 20" and 28", that seemed like the best number to have room to mount the Stihl length chain.
So now I can swap my current bars and chains between both brands.
If you have a mill and lathe great use them. I didn't and need to come up with an alternative bush plan.
Enjoy!
So here is what I did, if it helps some one else good.
First you need some sort of stud adapter, you could purchase or make your own.
Here is what I made using simple shop tools.
I ordered a 10 pack of .5 dia with a .250 thru hole 3/16 thick aluminum spacer from Mcmaster Carr Part# 92510A761.
Put 4 of them on a 1/4 bolt and tighten. Place in a drill press and then us a file to reduce the outside dia. to .470
Take a block of wood of plastic and drill a 1/2 hole through, then cut a slot so it will squeeze down when clamped.
Place a bushing in the hole clamp down and then drill the center out using an 11/32 drill. It will drill enough oversized to fit the 9mm stud.
Now the bar is 3/16 thick so you will need to reduce the thickness a few thousands. I just place the bushing over a screw head in the bench and take a couple swipes on each side with the file. Debur and your bushings are complete. A not about filing aluminum, it likes to gum up files use WD-40 or kerosene on your file to keep it from sticking. And a wire brush or file card help to clean out the teeth.
Now on to the Bar modifications.
First thing I did was to chamfer the oil holes using a die grinder and 1/8 carbide burr, as the Stihl holes are half a hole dia higher on the bar.
Next place layout lines to show 1/2 longer slot towards the nose end.
Then using a .045 cutoff wheel in my 4 1/2" grinder, I held tight to the sides and moved forward.
Then flip the bar over and finish the slots from the other side.
Then remove the material in the middle.
Use a file to debur.
Now you need to decide if you want to grind down the tensioning pin or drill out the hardened bar to 1/4" clearance. I chose to remove and grind down the pin on the bench grinder to fit the .230 dia hole.
Here is how it looks mounted.
I picked 1/2" because on all the bars I tried 16", 20" and 28", that seemed like the best number to have room to mount the Stihl length chain.
So now I can swap my current bars and chains between both brands.
If you have a mill and lathe great use them. I didn't and need to come up with an alternative bush plan.
Enjoy!
