G'day John et al.
The meter is a moving coil type. The inductance of the motor armature
should smooth the current enough for a reasonable accuracy.
BTW, meters used on much larger drives were moving coil type across
appropriate shunts.
The meter leads are connected into the wire from the positive output
of the controller to the reversing switch. I used insulated male and
female spade connectors and then taped them.
Finding a useful place to mount the meter was the biggest challenge,
hence it being hooked over the back of the chip guard.
There are not many places you can conveniently bring a cable out of
the control box. I used a cable gland just below the leadscrew
opening. The cable, which is standard 3 core flex, passes under the
lathe bed.
My controller is an SCR type by KB Electronics, a US firm. It appears
they manufacture a range of boards for machine tool and process
instrumentation applications. It has 5 trim pots!
One good turn deserves another.
Regards,
Ian
--- In 7x12minilathe@..., "born4something" <ajs@...>
wrote:
--- In 7x12minilathe@..., "Ian Foster" <fosterscons@>
wrote:
If anyone is interested I'll post some photos. BUT, how do you
post
photos on this group?
Good work Ian,
We all discussed this endlessly a month back but I don't recall
anyone opting to do & report. You can only figure so much on paper!
Proof of the pudding is...
In the photos area there's a Photos Help link up the top right.
Immediately below that should be a Create Album link and to the
left
of that an Add Photo link. Well, that's how it is in other groups
like the 7x10. I know the mod was trying to establish a new culture
when the 7x12 was started so must have turned that feature off. I
guess you need to ask the mod to do it for you.
I've seen photos of meters before <G> so other details mean more to
me. Where did you end up connecting it - in the AC mains feed or DC
motor wiring? Moving coil or moving iron? Is your controller FET or
SCR based? Can you quote your controller model (PCB sticker) since
your Real Bull machine could well differ to what many of us have?
Thanks,
John
