.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:
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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
