"Jim Wilkins" wrote in message
...
On Feb 12, 2:31 am, "Michael Koblic" wrote:
"Jim Wilkins" wrote in message
...
This is kind of my point: There are 297 adapters listed in that section.
Which one do you pick for this machine?
--
Michael Koblic,

All you need is a chunk of steel or iron the right size. I've made
adapters out of scrap hydraulic cylinder rod, a cast-iron pipe coupler
and a locating pin from an old Segway fender mold.

Barbell weights are the right shape, though the iron may be difficult
to cut. A few days of cooking inside the wood stove might soften then
up enough, it works well with flame-cut hot rolled steel.

Fitting an adapter to the spindle is easier if the adapter is on a
mandrel between centers so you can check the fit and replace the
adapter exactly concentric, to remove another half thousandths all the
way around. You could bolt it to the flange to cut it almost to size
quickly.

That presupposes a degree of skill on my part :-) I was doing a dry run in
my mind and got stuck at stage one: Getting the right holes drilled in the
right places if you cannot remove the flange and use transfer punches. But I
guess careful measurement would suffice. The next stage would involve a very
interrupted cut which presumably is not an issue with a lathe this size. BTW
can you part the piece out by having the parting tool at 90 degrees to the
usual direction? Cutting into the piece at the right angles with the tool
lined up along the lathe bed? I have seen it done with a wood lathe.

The good thing is that one would not have to cut large internal threads for
this spindle.


5" is a reasonable size for the chuck on a 10" lathe. You don't want
it to hit the carriage. I have a 5" 3 jaw and a 6" 4 jaw and have to
be very careful with the larger one, or set a stop.

Here is a question then: Say you have a 9" swing lathe and a 8" diameter,
0.25" thick plate of mild steel than needs a 6.5" hole bored in the centre.
You cannot hold it on the outside in a chuck. You cannot clamp it outside on
a face plate, even a wooden one. Not enough space for the clamps. What do
you do? Would making an 8" sacrificial face plate and super gluing the work
piece to it work? Would you cut the hole with a mill on a rotary table? None
of the above?

--
Michael Koblic,
Campbell River, BC