Member postings for colin hamilton

Clive thank you for the very kind offer I'll pm you now

Scary yep I would agree. But I'm also thinking it's still only wires. Worst comes to the worst I'm in for a new motor which is likely anyway if I can't sort it so what do I have to loose?

Blimey,

So I need to go deeper. Can I just confirm what I'm going to have a go at.

Release the wires bound onto the top of the stator.

Find three wires connected together (potentially the yellow ones).

Separate the three wires and assume them to be the finish end of the three windings.

Select each of the three (yellow) wires in turn and using continuity find its matching red wire. Mark up the wires so I know what's what.

Bring all 6 wires back up top and reconnect them for delta

Is that it?

So I definately dont have the option of reconfiguring the motor. There are only 3 wires. I'm going to try running it as is, perhaps trying to fool it as per the referenced blog post. If that's no good I think I will swap the motor out and perhaps take the opportunity to up the power to 2hp.

I was really hoping to have a go at my motor this weekend but it turned out I needed to move everything round to fit the mill in properly. Which meant I needed to reeork the electrics completely. My nice new ring main is in and I'm thinking my shop definately benefited from a proper tidy.

I'll be back on motor electrics this week

Robert thanks for the tip on resistance checking. This will be my first job at the weekend. Can you all please make yourselves available on Saturday morning for a raft of blurry photos and poorly constructed questions😀😀

Thanks everyone for the speedy and detailed responses

So I'm looking to buy myself a clamping set for my new to me series 1 bridgeport mill. I am more comfortable working in metric. Would it matter if I got a metric clamping set for my old mill? I was wondering if things like the t nuts would fit correctly?

Thanks

Colin

So I connected it up to the VFD I have for my lathe and it ran without any issues. I didn't have time to do any cutting so not sure about potential loss of torque yet.

It looks like the motor will dismantle without much effort so I might go looking for those pesky delta windings at the weekend!!

Clive, thanks for this. If itvus currently set up in star configuration and I connect it to a 220v 3 phase supply would it still run (perhaps with reduced torque?)

I'm pretty sure it's 3 phase. When I went to view the vendor had it plugged into a three phase supply. In the main junction box (on the mill) there are a number of breakers and a transformer, which I think is for the feed motor.

Gordon- yes my picture is ofvghevmotor connections. The additional box just contains the rotary swith for starting and reversing.

I've had a look online and I think I've got the same set up as this chap.

https://youtu.be/sVyTwJr-HUc

I'm new to all this so I may be misinterpreting you but I have a j head model and need to change speeds via a belt change

D

Im familiar with star and delta but this is different. It only has three wires and an earth in the connection box. It's a 3 phase motor

I'm just getting to know my bridgeport mill. The main motor is a bit unusual in has much it only gas 3 wires in the connector box. I have done a bit of research and it looks like this was standard for these English bridgeports. My motor plate is very faded but looks like it's badged as both 230/240v and 380/420V. Does this make it a 2 speed motor? Will it run on a single phase to 230V 3 phase inverter?

It's in safely. Thanks for all the advice. I'm glad I was prompted into getting some help lifting it. Now that I've moved it on the pallet truck and felt just how top heavy it is I am really glad I didn't need to wheel it down the ramp!!

Edited By colin hamilton on 14/01/2022 06:27:14

So I phoned the company I linked to and had a chat with them. Of course they are very keen on their product but he explained that they are VFDs that have been reworked specifically to be an alternative to a rotary phase convertor. They are sized to deal with the starting currents of the machines so you don't need to go for the big multiple. His advice is to round up to the next size up.

I do like the idea of these. Perhaps someone on here who is both knowledgeable and a doubler go give them a ring and give them a prope grilling on the subject and report back😀

Thank you all for your responses.

Clive- thanks for taking the time to giving me so much detail, it is very informative. I thought they were looking good value for money but I wasn't considering the requirement to oversize to accommodate the starting current. This is a shame and disappointing as it should be taken into account by the manufacturer. I do think that a digital phase convertor could be the ideal solution, perhaps it just needs a couple of years to mature.

Clive I may come back to you for a chat about 2 speed motors once I know specifically what I've got (I pick the mill up this weekend).

Cheers Colin