Mastermind
Work Saw Specialist
Something like this I'm thinking.....
Any Idea What This Is???
- Thread starter Mastermind
- Start date
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wasabi pea stand?
Mastermind
Work Saw Specialist
Yep, I just use a small shop press. Nuttin fancy.
To align crank halves a soft aluminum plate.
Drop.
Check.
Drop.
Check.
Drop.
Check.
Drop.
Check.
How about a Lathe to true the cranks?
tree monkey
Addicted to ArboristSite
nope, centers on the endsSomething like this I'm thinking.....
Yup. And don't have to be perfectly aligned.
big t double
Addicted to ArboristSite
Just subbing in and getting this one back up top. Most interesting thread here in weeks.
opcorn:
opcorn:
Mastermind
Work Saw Specialist
I just wanted to see how close I could get these by using a jig. Not good enough to press and run, but a hell of a lot better than just "eyeballing" it.
I press the pin in just part way first, easier the move the halves around and get things lined up before pressing it in all the way.
Then the fun with the lead hammer begins...
That stand looks more like something used for balancing, much like for doing a bike wheel.
There is a 'balance factor' (noted as a percentage, like 65%) that can be applied to alter the point in rpm where the least vibration occurs.
Would be more of a pain to do on one piece con rods, would need to be pressed together/apart twice.
Some math is used to figure out the relative reciprocating weight of the piston and rod, then an appropriate two piece 'donut' of that
weight is put on the pin and material added/subtracted from the counter weights to achieve desired balance.
Been a very long time since I've done any of that stuff.
Then the fun with the lead hammer begins...
That stand looks more like something used for balancing, much like for doing a bike wheel.
There is a 'balance factor' (noted as a percentage, like 65%) that can be applied to alter the point in rpm where the least vibration occurs.
Would be more of a pain to do on one piece con rods, would need to be pressed together/apart twice.
Some math is used to figure out the relative reciprocating weight of the piston and rod, then an appropriate two piece 'donut' of that
weight is put on the pin and material added/subtracted from the counter weights to achieve desired balance.
Been a very long time since I've done any of that stuff.
Yup, lathe + dial indicator + brass hammer. You can't really tell if you got it aligned properly untill you put it in the crankcase and spin it by hand. Spin freely = good to go.
My first m'cycle, a Ducati 350 single, had a pressed together crank w/roller bearing setup just like some saws.
Wonderful tinker toy. Shaft driven OHC with mouse trap valve springs. Itilian electric system was crap.
Recently I put new rollers in a 450 (desmo) Ducati crank, the originals had worn down only a bit but just enough to make me nervous.
Using not much more than the motor, rear wheel and bits of the frame from a '70 r/t to build a somewhat modernized road race type setup.
Getting pretty close to completion, though one of those long term projects that gets done in bursts of progress with lots of time in between.
That's a big reason I like saws, can build one in a day and for less than the cost of one Ducati part, lol...
Dude, if thats yer idea idea of action I need to take you downtown some summer night, sheesh, action, LMAO
Just bustin yer chops my man,
Pete
towingace
ArboristSite Guru
I was gonna say that but I woulda been cheatin' cuz I already saw it on SH.
splitpost
Nothing but 32:1
To be honest its the first time i seen one since the early 90's ,i borrowed one to rebuild my yz125H crank
Anyone have any measurements of different saw con rods/bearings/pins? It seems like the only feasable way to "cheaply" rebuild a saw crank where AM does not exist is to find a complete china crank for a different saw and cannibalize the rod pin and bearing from it.
Gypo Logger
Timber Baron
Is it a ported 3120 jug?
A shop towel?
with a little metal on it.
CJ
with a little metal on it.
CJ
just a que...how to tell, when the journals are where they are, phased to a one another?? and if they aren't pressed together perfect, for zero runout,, wont straightening them proper, make the journal real loose??? just que........ not being wise at all, as this is something I have thought about...also, you could have, the crank halves, perfectly phased to each other,,and have the crank pin off just a bit?????
