Re: Milling machine Z axis feed

On Jul 10, 10:35 am, Charles Ping <littlewro...@xxxxxxxxxxxxx> wrote:
I'm pondering the addition of a Z axis power feed to my Elliott UO
mill. Clearly there are numerousm machine specific detail design
features needed but does anyone have a suggestion of a suitable
motor/gearbox that will drive slowly and steadily.
Is this best solved by a bespoke stepper setup? I'd rather not use a
PC to drive anything though (because I don't have one in the workshop
and I'd rather not get one.)

All suggestions from all sources welcomed.

Thanks

Charles

Second try, first one is not showing up.

Here is about as simple as it gets for a variable speed feed.

View with fixed pitch font.

+ Power + Ref. voltage
| |
____________ | ______ \
| |_| | |_______/
__| |______| | \
|__| MOTOR |______| TACH | /
| |_ | |_ |
|____________| | |______| | |
| | |
| | |
|-| | |
MOSFET ||__________| |
|-| |
| |
|___________________|
|
- Power


The power and ref. voltages depend on the motor and tach. Voltages and
can be the same.

The pot should be around 5K to 30K, a resistor between the pot and the
ref. voltage can be used if needed.

The MOSFET can be just about anything but I would stay with something
with a voltage rating 4 or 5 times the power voltage. Current rating
should also be well over rated as it will be operating in the analog
range. It should be on a heat sink of some kind and you can parallel
them for more current and or less concentrated heat.

Start with the pot set to the lowest voltage and if the motor runs
away swap the connections to the tach. Now as you turn up the pot the
motor should start turning and within reason it will hold a constant
at whatever speed you set.

Add a 4 pole double throw switch or relay to swap both motor and tach
connections to reverse the motor direction.


___________
Andre' B.

.

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