Member postings for Grotto

Thanks Les, really appreciate the advice

the resistance of the black wires is around 3.8 ohms.

the green wires don't appear to form a circuit(?) as resistance doesn't read.

I'll have a better look in the morning

Thanks

The Gryphon motor is 1.25 hp which seems a little grunty for an ML7, it 's also 2850 rpm which may (?) cause issues (not sure about this.

The other motor (Gill & Son) is 1,450rpm which is what my 3 phase one was. I don't think it's capacitor start (no visible capcitor).

I've undone the wires on the Gill motor and it looks like there is (just) enough length to attach them to a connector block.

I have a multi meter, but am not sure how to test which are main winding & which are auxiliary. At present, one black and one green attach to each of the terminals (there are 2 green wires & 2 black).

On the Gryphon motor the capcitor wires (bottom right of photo) attach Black to A1, and Red to Z1. The power input wires attach Red to A1, and Black to A2.

I'm wondering if it would be best to use a different (single phase) motor.

I have a Gryphon on my bench saw which is 3/4 h.p. and has 4 terminals (A1, A2, Z1, Z2)

It's capcitor start, but still not sure how to wire it as at present live and neutral (form power source) only go to 2 terminals

Further to my previous post (year or so ago)...

I've had a good trawl on the net, and have found numerous pages showing how to do this, but I think I must lack the knowledge to understand.

I'm replacing my 3 phase motor with a single phase (looked at getting 3 phase but way too expensive, 3 phase motor is not the correct type to run single phase).

I have a single phase motor (0.6 hp, type BSP) which only has two terminals.

All the diagrams I've seen for wiring motor to Dewhurst have more terminals.

Should I be separating the wires?

Any help would be appreciated, as I even tried getting an electrician to sort it but he said he didn't know what to do.

Thanks

Well I've bought an A&R Toolpost & 6 holders, they reckon they've found a boring tool holder so i'll get that as well.

The info says the tool holders take 1/2"/12mm tools.

I'm wondering if this is the maximum, or if tools have to be 1/2"?

Will I have to shim my 10mm tools?

Also, I have a few tools which have a shaft larger than 12mm. Is there a downside to grinding these down to 12mm so they fit?

Thanks

Thanks Eric

I'll keep them in mind next time I'm after something.

I've bought an A&R set which I'll get posted to me in the UK and pick up next time I'm there. I may even be able to reclaim the VAT when I leave, but maybe that's a bit hopeful.

Thanks,

Ian - I'm in Auckland have seen some up here but they have been of questionable quality. Although they come with a guarantee, i don't use my lathe enough to give them a good work out before the guarantee expires. Prices in the UK also seem to be lower, but maybe that's just down to the exchange rate.

I think I'll go ahead and get an A&R one with some holders. They only have standard holders at the moment, but hopefully they'll get some others before December which is when I'll get a chance to collect them.

I'm guessing RDG are out of stock, as the Myford one they have on eBay is 900 pounds.

I was looking at one from "Myford" on eBay which is branded Myford.

I haven't been impressed with some of the Asian stuff I've seen so would prefer to get something made in the UK.

I'm thinking about getting a QT tool post for my Myford ML7.

I've seen posts about some brands being not so good, and as I'm in NZ it would be a hassle to return one, so would like to get something good.

I've seen a couple on eBay, one from Myford, and one from A&R Precision. The A&R is priced lower (85 pounds) than the Myford one (120 pounds).

I'll pick up either when I'm next in the UK as they seem to be extremely pricey over here.

I'd appreciate any advice

Thanks for the advice.

my knowledge of electrical stuff is extremely limited and the details I quoted were based on what the supplier of inverters told me.

i'm in New Zealand, so we're 240 volts.

I've added 3 photos to my album which show the motor and it's wiring. I'll talk to a friend who's an electrician and see if he can do the re-wiring for me or point me at someone who can.

Hi all

I'm a newbie to the forum (and lathes).

I've recently acquired an ML7 which has a 3 phase 1/2 h.p. motor.

the motor is "Y" wired for 415v with no secondary wiring. I can get a VFD inverter to run it, but I've been told there will be a speed penalty (it will run at 800rpm).

Torque would be the same if frequency is set lower.

All the above info has been supplied to me, I not sure on the theory behind it.

My questions are....

Will running at 800 rpm affect anything, if so can I just change the motor pulley to compensate?

Will there be any advantage in running 3 phase using a VFD inverter, or should I just get a single phase motor?

What is the best h.p. motor to use on an ML7?

I've got a unimat3 which I've used over the last few years, and before that my lathe experience was limited to 25 years ago at school. I don't have any specific planned use for the lathe, just playing around and making the odd bit for my bikes, but don't want to go down the wrong route and regret it later.

thanks