Hows your spindle bearings ? Have you done the test by using a
rod through the spindle hole & lifting the rod to see what
your clearances are ? Whats your finished product look like ? Like
everyone else says you should be able to do better than your
getting right now . I've been using HSS inserts from H R Warner
for years now & I have absolutely no problem getting 0.030
& sometimes more in most things except for some mystery metal
I have ended up using . I'm using a regular v-belt on the
countershaft motor to large pulley , & a composite flat belt
on the cone pulleys . See if theres a industrial belting company
in your neck of the woods & visit them & have them make
you a belt . I think I paid 10 bucks for mine . The oil on your
belts does need to get fixed somehow .
animal
On 6/25/23 8:32 PM, Mike Poore wrote:
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.050 should be obtainable on a SB9.
If the belt is slipping, you should try to increase the tension
first. Link belts are usually not a problem. Disconnect the belts
and confirm that the spindle turns freely. Large diameter work is
more likely to cause slipping due to the torque required. Try back
gear for large diameter work.
On 6/25/2023 4:13 PM, Steven Schlegel
wrote:
Wow. Lots of questions. One fact is
really obvious. My machine operator pair should take cuts 10x
deeper than I am.
The lathe head and all associated
gearing is good. It was recently rebuilt and all pins, etc.
were replaced correctly. Of that I am pretty certain. The
drive unit moves freely, was also rebuilt, and operates
correctly.?
Speeds are from the ebay chart I
bought. The HSS tools I grind are based upon lots of videos I
watch. I bought a jig to help get the angles correct. My
carbide are inserts, many are still the original chinesium,
but are being replaced by higher quality as they die. I use a
Boxer quick change toolpost.
Now, here is where I feel the problem
lies since I do not have the power to make deep cuts:?
I use a link belt on the motor. It
slips especially as oil gets on it. The bearing in the drive
unit slings oil. The drive belt to the lathe head is a
serpentine auto belt. It seems to transfer power efficiently.
The drive unit is mounted on channel so it's adjustable.??
I am wondering about switching to an
auto v-belt for the motor. Next, could the channel be flexing?
It is the kind used to support conduit.
Thanks,
Steven
Get
What sort of carbide are you using? I've never had good
luck with the 0 degree rake brazed carbide. I hear that it
wants to run really fast.
On 6/25/23 14:24, Brandon Corey
wrote:
0.002” is way too low. ?I run
0.015”-0.020” at a minimum for the hardest materials.
?Material? ?Speeds? ?What size is your motor?
Brandon
I have a simple question. How deep
of cuts do you normally make?
I have a 1949 vintage SB9C, with 6 speeds. I
replaced the 1/4 hp motor with a 1/2 HP one. I
use carbide a lot, but HSS still gets used some.
Many of the videos say I should take at least a
0.005" cut for the best finish. I usually cannot
take more than 0.002" with dragging down, or
stopping, the spindle.
What's reasonable for me?
Thanks, Steven
