Member postings for wrinx

The power feed motor is 90v - there's a few potential controllers on ebay so I'm sure one will be right for the job

wrinx

I could send it back but I'm happy to put it into stock for when the motor finally goes...or I'll sell it later if I decide to go 3-phase.

wrinx

Well well...multiple numpty of the week awards to me!

Presumed the spindle motor had died after witnessing sparks and smoke emissions, and knowing how fragile they are on these machines I jumped to the conclusion it had died. Turns out the motor had burnt through one of the power wires, now repaired and it spins fine under power although I haven't tested it under load yet. There may be a reason it overheated and burnt the wire but a replacement motor is on its way and will go into stock if the original is fine.

The power feed motor was presumed dead because, again, they are a known weak point. Replacement motor also dead which is odd, so put 12v through it and it spins! Looks like the original motor (which is definitely dead) went pop and took out the board No replacement for these board so I need to look for an alternative power source Trying to order another motor for a spare again because they are getting hard to find.

Still looking to fit a 3-phase motor in future!

wrinx

Very true! Your post reminded me to take apart my "presumed dead" motor to find out what happened...was quite surprised to see a burnt and broken wire! After a repair it powered up fine although I've yet to test it under load,

So, thanks for the reminder

wrinx

Thanks Ian

wrinx

Very nice part of Derbyshire...and a lovely car!

wrinx

Thanks Dave - thinking about it I've done three! All involved using pendants which make it more or less plug and play but I was hoping to keep the original box this time, however my knowledge of switches and electrickery is a bit shaky.

Best approach may to to find a pendant I can sink into the existing box.

Also need to find a 3-phase motor that'll fit too, space is a bit limited up there.

wrinx

Edited By wrinx on 17/03/2020 19:04:33

Wow...didn't know this thanks for the warning! I tend to avoid working with aluminium anyway, but I'll know to thoroughly clean up afterwards in future.

wrinx

I've just experienced something (possibly) similar - the spindle motor on my mill has just gone pop and took out the main board fuse. I didn't realise the fuse had gone until testing whether there was power to the motor and found nothing at all.

Replacing the fuse restored power - does the the Sieg have a board fuse? If so it could be your motor is shot and the fuse protected the board.

wrinx

Edited By wrinx on 17/03/2020 14:40:00

They're for general use and messing about really, I'm not a model maker but if a job can be done better with one of the machines I'm there! Basically, I like to keep my hand in with a bit of metalwork, fabrication, welding and maintenance.

wrinx

Just read your intro post - hello

wrinx

Thanks Bill - this is my other thread which details the problems.

Click...

wrinx

Edited By wrinx on 17/03/2020 12:05:39

Hi All

I've been popping into this forum occasionally for the past few years and thought I'd join to see if anyone can help with my current problem...and perhaps help someone else in turn!

I live in Chesterfield, Derbyshire and started my working life in a fabrication workshop, making ornamental lighting and other fittings for the pub/restaurant trade. I work in a totally different environment now but have always enjoyed metalworking and working on my cars.

The current major project is a full and final refurb of my garage, in preparation for early retirement in a few years - I intend to spend a lot of time in there so it needs to be fit for purpose.

I have a green metric Boxford lathe, a G0704 size milling machine with the long table (with two burnt out motors!!!) and various other bits of machinery and tools to play with...so an hour in the garage can easily turn into a day!

wrinx

Hi All

I'm hoping someone has had a similar experience and may be able to offer some advice or direction.

In the space of one week both the x-axis power feed motor and spindle motor have failed on my milling machine (G0704 type - 750w motor)...bad luck indeed!

I've already replaced one motor in the power feed unit and bought a second spare at the same time. Tried fitting that one but it's also dead, or I've damaged the unit more that I thought. I've got a source for a replacement so we'll see.

A few days later, the spindle motor went, this is apparently very common for these machines so perhaps I should be grateful it lasted over five years - the smoke being emitted last week was in hindsight more than a clue of things to come!

A quick search of the 'net proved these are a little harder to source and there appears to have been a variety of motors fitted to these machines over the years. I found a couple of sources for a replacement but I also have an eye on the future - what happens when it fails again at any point over the next few years and parts are even harder to come by? The only reason for continuing with the OE option at this point is to get me up and running whilst I research alternatives, which leads me on to the question...

I plan to convert the mill to three phase, powered by an inverter. I've previously done this for my old Myford S7, current Boxford lathe and Boxford pedestal drill. I love the flexibility and control this solution provides; plus the motors are sturdy, easy to source and relatively cheap, as are the inverters.

Has anyone here converted their chinese mill to run on 3-phase? If so, which motor did you use, how big is it and how are you controlling it? This last part is in reference to the OE switches, is it possible to retain the original look? The on-off switch will need replacing for a momentary version (I think) and I'm not sure about the rotary switch? I'm interested in what can be done.

If all else fails I'll just buy a control pendant from ebay and wire that in, but would really like to keep the original switches if possible.

Thanks for reading...

wrinx