tim,
i calculated things as follows...the machine currently is capable of
11 5/8", inside of the bed rails...i am shooting for 18" so i thought 6
1/2" should get me there...but when you are doing an 18" piece, your rough
glue up will be bigger, of course...so i did want a bit more...so i went
for 8" pieces(nice round number) that wound up to be 7 13/16", after
squaring of the ends on a sanding machine...so my finished, exact, maximum
diameter size will be(drum roll please...LOL) 19 7/16" between the bed
rails...did consider raising the "Y" carriage but i would still need to do
the work i am doing now, so i wanted to keep it simple and avoid any
additional work(did i really just say that?)...currently the distance
between the headstock center and the lead screw center is 10 5/8" +/-...add
half of the 7 13/16" and the new dimension is 14 1/2" +/-, just like you
said...the idler gear on the legacy gear train is 2 9/16" in diameter...i
have an extra from my donor machine and an added plus that it is already
set up on a piece of the gear train "U" channel...stole the matching 2
9/16" gear from the extra set of pitch gears(didn't like doing that!), i
have, adding the small ball bearing to it and hopefully this will work to
compensate for the added length to the gear train...so the line up would
be-pitch gear on lead screw,current idler gear(with the large washers on
it),the new pitch gear(no washers),new idler gear(with washers), then the
gear that goes on the 3/8" pin at the center of the gear carriage...i am
about 1 1/4" longer than i need be, but i hope the adjustments in the gear
train will compensate for this...figured i had to add two gears so there
would be no chance of any gear slipping off another gear, so long as those
double washers do their job...reversing a spiral still remains the same,
just take out the first idler and put in the reverse gear set up...it all
sounds good in theory and on paper but making it happen is going to be a
big job...thanks for taking the time to respond and encouragement...i need
it!...joe
>
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