Split Point Drill sharpening

[tonyfoale]

'We' are correct; me barely, Tony accurate.
In my defense, the tag was very hard to read until cleaning it better.

I thought it strange that you had a 50 Hz motor in the US.

[Toolmaker51]

Not unusual to find scattered 50Hz machines, rare though to find unmounted 50Hz motors.
I have two machines at 50Hz that will be remedied with VFD's. One is the 50 NM taper Herbert-DeVleig 4B, other a 40 NM Rambaudi.

[tonyfoale]

Not unusual to find scattered 50Hz machines, rare though to find unmounted 50Hz motors.
I have two machines at 50Hz that will be remedied with VFD's. One is the 50 NM taper Herbert-DeVleig 4B, other a 40 NM Rambaudi.

Most well built 50 Hz motors will tolerate 60 Hz, of course they will run 20% faster and lose some torque if run on the rated voltage.
I have the opposite, I brought back some machines tools from my time in the US and so I have to run 60 Hz motors at 50 Hz. No problem with 3 ph motors because I run those on VFDs to get full speed, but my lathe has a 2 hp 1 ph motor and so it runs slower than it could. I am currently chasing a 5 hp 3 ph motor to put in its place. I do not need 5 hp but using an oversize motor with a VFD gives good torque at lower speeds than a smaller motor.

[tonyfoale]

Tag indicates a single voltage motor, but capable two different RPM 1500 and 3000, by switching leads [not direction, or change 220/440, RPM only].

As I said before that is a 2/4 pole motor. Today on our favourite auction site I picked up a 5 hp 4/8 pole motor. That means 1500 and 750 rpm. Heavy and big, multipole motors need more iron and copper inside.
I shall fit it to my lathe which will enable me to ditch the two stage pulley system and noisy back gears and replace them with a pole number switch and VFD. I am hopeful that this will produce a smoother and quieter machine capable of the lowest speed that I am likely to need and a faster machine at the other end.
A close to 1:1 pulley and poly-V belt system should be all I need.

[G.Paul]

Congrats you just ruined the drill bit look how nice and blue it turned. A split point is fine i done this for over 50 years. You never sharpen a drill bit on the side of the grinding wheel