Fire Wood Processor

[RobWilson]

Thanks for the reply Steve  

It never crossed my mined there would be teeth on the back/underside of the chain 


Cheers Rob 

[Black Forest]

Did you incorporate an orifice in the bar for chain oil? I built a hydraulic chain saw for my excavator. On it I used a type of custom made hydraulic cylinder that acts like a syringe. Every time the saw is activated it injects a measured amount of oil into the bar. It is adjustable from 5cc to 30cc per activation. It is a single acting cylinder with two compartments. The bottom compartment sucks the oil out of the tank for the bar chain oil. A check valve stops the oil from returning to the tank. A spring pushes the piston back up and when it does it sucks the oil from the tank. It is very reliable and gives a great supply of oil without wasting oil.

Nice job on the firewood processor.

[f350ca]

Interesting timing on the post. Thats what Im building today, and it sounds like the same design. Not sure if I'll make it adjustable, Oregon wants 1/2 cubic inch of oil per cut.

[Black Forest]

(05-12-2015, 01:04 PM)f350ca Wrote: Interesting timing on the post. Thats what Im building today, and it sounds like the same design. Not sure if I'll make  it adjustable, Oregon wants 1/2 cubic inch of oil per cut.

will yours be double acting or single? Will you Tee into the downfeed cylinder to power the pump?

[f350ca]

Single acting with spring return as you made. Plan on tying into the down feed, which should only have about 300 psi, regulated pressure to give the down force on the bar that Oregon recommends.
Made the cylinder today from a piece of 3/4 stainless pipe I had. Was rather unique working with a known alloy, 304 , was stumped on the nipple I used. Bored it to get it round then reamed and honed it. Made a brass pistol with 2 o rings for seals, should have square quad rings but these were in stock.

[Black Forest]

Have you got it worked out regarding your check valves and their arrangement?

[f350ca]

Got the check valves sorted. 
All the bits and pieces made.


Tried stroking the piston by hand and it primed and pumped fine.



When I was assembling it the bolts kept drawing up, but finally tightened. Went to push the piston down with a punch through the hydraulic inlet and it wouldn't budge. HUM



This was one of my build without a drawing projects. Might have caught the fact that after I reamed the barrel and honed it I had .1 wall, the ring grove is .080 deep. Still rather surprised it collapsed on both ends. Don't think I can even get the piston out now without machining the barrel away.

[DaveH]

Sorry to hear that Greg, bit of a bummer.
It still looked nicely made    
 
DaveH

[EdK]

(05-15-2015, 06:51 PM)f350ca Wrote: ...

Tried stroking the piston by hand and it primed and pumped fine.

...

I do that most nights without a problem.  

Ed

[RobWilson]

I am sure its just a wee hiccup Greg 


So am I correct in thinking the chainsaw chain needs to be lubed? and as the chain arm/bar is brought down it gets a squirt of lube ?  


Rob