Myford Hoover Motor

[Maurice TaylorParticipant @mauricetaylor82093]

Posted by AJAX on 03/12/2020 23:57:03:

Maurice, I'm interested in your scope setup. I'm familiar with the picoscope as I have one myself but never seen or used the automotive one. Are you using it with a clamp meter probe? I have a clamp meter but not for the scope. If I needed current logging I might use a current sense resistor and do it that way.

Hi, My setup consists of Picoscope 4225 and a current clamp Picoscope TA167 .The automotive scope will also run the ordinary Picoscope software.

When I got my clamp I wanted to measure starter motor current ,so I couldn’t consider a sense resistor ,it goes up to 2000A, There is a cheaper Pico clamp at £99 , this goes up to 600A, I would go for a clamp,no chance of damageing scope.

Hope this helps

Maurice

[not done it yetParticipant @notdoneityet]

I blew a fuse yesterday. I left a 5A fuse in a plug on a lead for a 1 1/4 HP motor drive (via a VFD). It lasted for quite a lot of soft starts but gave up on a heavy load. Fitted the correct 13A fuse for the supply lead and all has been OK since.

[Michael GilliganParticipant @michaelgilligan61133]

It may be worth reading this old thread from 2012 :**LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=73175

I took advice from MEW and did what appeared to be the right thing

… and was then chastised/ridiculed for it

… but life’s like that.

MichaelG.

[old martParticipant @oldmart]

Having looked at your link, Michael, I would also warn those people with old electric drills about the state of the insulation of the wiring. I bought a Black & Decker D720, (the two speed with the metal body and 3/8" chuck) in the late sixties. About 20 years later, I had reason to unscrew the plate on the side of the handle and found the wiring insulation all cracking up. It got binned straight away and replaced by a plastic bodied double insulated one. There are lots of cherished old mains operated tools out there still in use, hopefully their earth connections are still good and the RCD's in use today will save somebodies life.

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