Member postings for mtrehy mtrehy

Managed to sort it out. Was definitely interference. Removed the sensor cable and twisted all 3 wires together, wrapped them in aluminium foil and then back in the sleeving and it now works perfectly.

Thanks for all the replies.

I'll get some pics tomorrow. I tried magnet both ways and not a massive difference either way.

Brass hex so I assume not possible to create any issue....

HI,

Would be very grateful for some help with this.... I have bought one of these and attached it to my bridgeport. It seems to behave very strangely. I have placed it on top and added a bit of hex bar at the end of the drawbar - hex is 30mm AF and I have attached the magnet on one of the corners of the hex so it's probably on a 35ish diameter....

The bridgeport has VFD.

The rpm readout either jumps all over the place or doesn't read at all (----). It was slightly better but not perfect if I move the display a long way from the mill (I was suspecting some kind of interference). Doesn't make any difference whether the spindle is fast or slow. If I have the mill off and turn the spindle by hand it seems to read ok. If I try to replicate that speed with the slowest the mill will go it still plays up.

Can the sensors and/or unit be affected by interference from the VFD? Apologies if this is a stupid question but it's not my area of expertise. Will the 30mm (approx) diameter of the magnet mounting be enough or does it need to be on a bigger disk?

Any help greatly appreciated!

THanks

Hi Murray,

I'd certainly be interested - I rarely feel the need to go beyond 1500 rpm.

THanks

Thanks larry. I might end up going that route. Getting the mill for the cost of shipping only is a piece of good fortune but it hasn't boosted my bank balance at all - i.e I didn't have a milling machine in the annual budget!

I'm in no great rush to sort this out as I'm having work done on the workshop that takes it out of action for a month at least so gives me time to assess options. Motor modifications, vfd, switchgear etc will end up about 1/2 the price of a 3hp rotary but the rotary can be used on other future machinery.

i notice on ebay lots of plans for DIY rotary converters - has anyone here built one?

I've ruled out static converters.

Thanks for the replies.

I'm not too keen on a static converter - read lots about them not working well with milling machines so feels a bit hit and miss..?

Rotary phase converter seems very expensive and I would think I could get a 2nd hand 230V 3-Phase motor and make it fit and then add VFD considerably cheaper.

That chinese Ecogoo option sounds perfect though - almost too perfect. Is it too good to be true?

Hi All,

I've just become the owner of a Bridgeport Mill. Even better it was free (except £150 delivery).

On the motor plate it says 380/420, 3.2/2.1, 2700,1420, CONT INS E, SC, Frame 7, HP 2.0/1.0

I want to run it off 240v single with a VFD. I have already setup a lathe like this. I assume that this motor would not be compatible as it's not 240/415 - could someone with more knowledge than me please confirm this please.

I've attached a few pics.

Any help much appreciated.

Thanks

Pretty much complete. Done quite cheap but lots of time spent!

New motor was about £25 and the used VFD about the same. I spent £40 on a 10L parts washer that will be the coolant system. A few quid on switchgear and sight glasses etc.

About 50 hours work I think - was stripped completely into component parts and bare metalled. Added a drawer to the stand and will add a large draw under the electrical panel when I get some time

On my imperial machine it's 21/120, 100/60 which I think gives 0.001" per revolution.

On yours changing the 30 to 60 (assuming this is gear Y) should reduce the feed 50%

THe motor i have found is foot mount and looks similar size. Not sure about the pulley fitting but sure I can engineer some way of fixing the original pulley in place. Fixing centres are 145 width x 102 length. 15kg, 25mm Shaft x 50mm length.

I'm missing everything coolant related. Not sure what to do about this at the moment. Tempted to knock up a temporary windscreen washer pump to a heath robinson reservoir. Don't want this to turn into too much of a money pit just yet.

Thanks guys.

Edited By mtrehy mtrehy on 22/01/2018 21:18:22

There are no teeth missing - mostly wear and a few chips - the worst are shown here:

HI Muzzer,

Would this motor be a good option with a VFD?

THanks

It didn't come with any additional change gears. It's got 35, 120, 100 & 30 installed. I guess I will need to get some others if I want to do metric threads.

I also like being able to run in reverse when screwcutting - any idea whether it will be possible to get the current motor to run reverse?

Thanks for your help.