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Author Topic: Finally Running!  (Read 2269 times)

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Offline marty3d

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Finally Running!
« on: April 05, 2021, 11:35:08 AM »
A few years ago we had a microburst that center-punched my property - knocked down 30-40 trees.  As I was clearing that, I was thinking about how I would like to use the wood - and a sawmill seemed a good choice.  I ended up buying a sawframe kit from Linn Lumber and started designing and building the rest myself.  I wanted to do both boards and firewood with it, so it became a bit complicated.  The sawmill portion is now mostly done.  Blade guards are being finished right now 'cause I don't want to be eaten by the machine.  The engine is a 32hp Generac - given to me by friends after their shop burned up - including the rest of the generator set.  The little control box runs the show.

  

 

 

 

 

   
Retired - and busier than ever.

Offline kelLOGg

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Re: Finally Running!
« Reply #1 on: April 05, 2021, 11:51:37 AM »
Nice work. I'm interested in how you will cut firewood and lumber on the same machine. 
Cook's MP-32, 20HP, 20' (modified w/ power feed, up/down, loader/turner)
DH kiln, CatClaw setter and sharpener, tandem trailer, log arch, tractor, thumb tacks

Offline Wassup8687

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Re: Finally Running!
« Reply #2 on: April 05, 2021, 04:12:35 PM »
Very ingenious. Good luck with it.

Offline Brob1969

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Re: Finally Running!
« Reply #3 on: April 05, 2021, 05:45:02 PM »
I am REALLY interested to learn more about your hydraulic setup. 

What kind of pump are you using?  How many gpm?  What controls?

Looks like you are moving right along with the build.  
Looking forward to seeing more.
1990 Woodmizer LT40, 18 HP Briggs Twin II
1980 Ford 555 backhoe
1996 John Deere 4475 Skid-Steer

Offline marty3d

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Re: Finally Running!
« Reply #4 on: April 05, 2021, 07:12:35 PM »
The hydraulic pump is kinda generic - runs on 12v or 24v.  I am using 24.  You can find it using this AISN number: B01D2ESPKM. It puts out about 3gpm.  Raises and lowers the backstop and what I call the pincher.  The pincher pushes the log or cant against the backstops and holds it there.  It takes just 5 seconds or so to raise or lower.  I am using an Arduino to control everything - it operates the hydraulic directional control valves through a MOSFET board (power transistors).  I have a log rotator in the works which will also raise/lower and rotate using the hydraulics.  I have it set up so I can push one button and use the joystick to position the saw head, up or down, fwd or rev.  A different button engages the cut and locks out the vertical.  The cut speed is controlled by a knob that you can leave from one cut to the next.  Just push the button and it goes.  The vertical is operated by two large stepper motors.  Kinda slow, but I can get repeatable cuts within a few thousandths of an inch (each step is 1/4000").
Retired - and busier than ever.

Offline marty3d

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Re: Finally Running!
« Reply #5 on: April 05, 2021, 07:16:35 PM »
I did the first cut about 15 minutes ago.  I intended to have 'cruise control' on the motor but that isn't working yet.  Still, cuts fast and no alignment issues.  At this point, I give it some throttle, push the cut button, and I can control engine speed using the cut-speed knob.  Kicks the board off as it backs up.
Retired - and busier than ever.

Offline Nebraska

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Re: Finally Running!
« Reply #6 on: April 05, 2021, 09:45:35 PM »
Congratulations on the build! :)

Online trimguy

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Re: Finally Running!
« Reply #7 on: April 06, 2021, 12:11:18 PM »
Nice job !!

Online btulloh

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Re: Finally Running!
« Reply #8 on: April 06, 2021, 01:11:06 PM »
What kind of steppers are you using?
HM126

Offline marty3d

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Re: Finally Running!
« Reply #9 on: April 06, 2021, 01:31:26 PM »
What kind of steppers are you using?
NEMA34, 1712 oz-in.  I think they were from StepperOnline...not100% sure.
Retired - and busier than ever.

Offline sawguy21

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Re: Finally Running!
« Reply #10 on: April 06, 2021, 02:26:09 PM »
How are you coupling the engine to the drive? I assume being from a generator the crankshaft is tapered.
old age and treachery will always overcome youth and enthusiasm

Offline Osterman.r

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Re: Finally Running!
« Reply #11 on: April 06, 2021, 02:32:27 PM »
Also, did you put a carb on the motor? Assuming it was run on propane in a genset?

Offline Vautour

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Re: Finally Running!
« Reply #12 on: April 07, 2021, 05:23:36 AM »
Nice solide build... i've got the very same 32 hp generac motor on my ongoing build and am curious how you Mcgivered the shaft.... @sawguy21 if i remember correctly you mentioned to me that those motors were not made to have a side load and would eventually blow the bearing and motor casing apart and was very grateful for that tip,.. so i added a coupler and jackshaft for my pulley.
the Gospel is WANTED by the people in 52 Countries but made illegal by their Government

Offline marty3d

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Re: Finally Running!
« Reply #13 on: April 07, 2021, 11:45:50 PM »
How are you coupling the engine to the drive? I assume being from a generator the crankshaft is tapered.
I ended up machining a taper into the centrifugal clutch/drive pulley.   
Retired - and busier than ever.

Offline marty3d

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Re: Finally Running!
« Reply #14 on: April 07, 2021, 11:48:09 PM »
Also, did you put a carb on the motor? Assuming it was run on propane in a genset?
I bought a carb and manifold online - the original manifold was plastic and burned up anyway.  The manifold was intended for a vertical shaft motor so I cut the ends off, rotated them, and attached it back together with sections of hose.  I am using two hobby servos to operate the choke and throttle.
Retired - and busier than ever.

Offline marty3d

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Re: Finally Running!
« Reply #15 on: April 07, 2021, 11:51:48 PM »
Nice solide build... i've got the very same 32 hp generac motor on my ongoing build and am curious how you Mcgivered the shaft.... @sawguy21 if i remember correctly you mentioned to me that those motors were not made to have a side load and would eventually blow the bearing and motor casing apart and was very grateful for that tip,.. so i added a coupler and jackshaft for my pulley.
I hadn't heard that about the limited side loading.  I did find that the motors had straight shafts in some applications - different crankshaft.  That at least suggests that side loading is possible.  I think Dixie Mowers uses these with a vertical shaft in some of their large ZTR mowers.
Retired - and busier than ever.

Offline Brob1969

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Re: Finally Running!
« Reply #16 on: April 07, 2021, 11:58:48 PM »
How are you coupling the engine to the drive? I assume being from a generator the crankshaft is tapered.
I ended up machining a taper into the centrifugal clutch/drive pulley.  
I once had a Chinese diesel generator that the generator side blew up but the little single cylinder diesel was still going strong.  
I "milled" the tapered shaft to accept a pulley.  By milled I mean I started the engine and ran my angle grinder back and forth on the shaft until I got it relatively even and slightly oversized.  Then I used a flat bastard file to get it to size, then sandpaper to finish it off.  I did it all on the back of my pickup, it actually worked out pretty well. 
1990 Woodmizer LT40, 18 HP Briggs Twin II
1980 Ford 555 backhoe
1996 John Deere 4475 Skid-Steer

Offline marty3d

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Re: Finally Running!
« Reply #17 on: April 08, 2021, 12:02:59 AM »
My son-in-law and I took the machine out to Montana to cut some wood for friend.  Having only sawed one log as a trial run, we brought a large assortment of tools with us.  The logs were Douglas Fir, blown down in a windstorm a few months ago.  For the most part, the machine worked - decently - but there is much room for improvement.  I programmed a 'cruise control' or governor for the throttle, but the microcontroller lost track of rpms when they got over 1700 or so.  In that event, it went to full throttle and threatened to scatter the motor parts all over the property.  I am installing a faster microcontroller.  

In a similar electronic vein, the main microcontroller refuses to talk to the controller in the control box - so I don't get height, cut, or power readouts.  So, hand measuring, which really slows things down.  

And, a few other things, but the potential remains.  I now have four days to effect improvements - and go back for more.

CANI - constant and never-ending improvement.
Retired - and busier than ever.

Offline marty3d

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Re: Finally Running!
« Reply #18 on: April 08, 2021, 12:09:54 AM »
How are you coupling the engine to the drive? I assume being from a generator the crankshaft is tapered.
I ended up machining a taper into the centrifugal clutch/drive pulley.  
I once had a Chinese diesel generator that the generator side blew up but the little single cylinder diesel was still going strong.  
I "milled" the tapered shaft to accept a pulley.  By milled I mean I started the engine and ran my angle grinder back and forth on the shaft until I got it relatively even and slightly oversized.  Then I used a flat bastard file to get it to size, then sandpaper to finish it off.  I did it all on the back of my pickup, it actually worked out pretty well.
I used to be a waterfront guy - and one time a tugboat came in with a wrecked gearbox.  The factory sent a new gearbox, with a technician (probably a $100k box).  Well one of the shafts arrived without a keyway.  This tech borrowed a jig saw and spent a whole day carving a keyway and filing it by hand so things would work.  Machinery hacks are the best - imho.
Retired - and busier than ever.

Offline nativewolf

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Re: Finally Running!
« Reply #19 on: April 08, 2021, 06:55:40 AM »
@mike_belben You'll like this one
Liking Walnut


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