Harrison M300

Shox Dr · Apr 27, 2020

daedalusminos said:
Apron reassembled and installed with no problems nor leaks.

After soaking the screw cutting gearbox in kerosene for several days it emerged in pretty much same state so stripped the selector fork, drum and 8 position indexed knob, thoroughly cleaned and reassembled with new o rings. After spending a good hour tweaking the change is very smooth...

View attachment 226537

With the screw cutting gearbox reinstalled it was time to wire up the VFD. It's now I'm wishing I hadn't upgraded to a 4kW model - it's massive.

View attachment 226538

I don't want to mount it external to the lathe so I'm going to have to cut a hole in the pedestal wall inside the electrical compartment....a job for tomorrow.

Isthat 4hp per channel. My alen bradley vfd is, takes an age to wind up max rpm. I’ve got a 7.5hp to cure that

Welderpaul · Apr 27, 2020

daedalusminos said:
Apron reassembled and installed with no problems nor leaks.

After soaking the screw cutting gearbox in kerosene for several days it emerged in pretty much same state so stripped the selector fork, drum and 8 position indexed knob, thoroughly cleaned and reassembled with new o rings. After spending a good hour tweaking the change is very smooth...

View attachment 226537

With the screw cutting gearbox reinstalled it was time to wire up the VFD. It's now I'm wishing I hadn't upgraded to a 4kW model - it's massive.

View attachment 226538

I don't want to mount it external to the lathe so I'm going to have to cut a hole in the pedestal wall inside the electrical compartment....a job for tomorrow.

I've just let one into the back of the cabinet. Easy enough to do.

Brad93 · Apr 28, 2020

Welderpaul said:
I've just let one into the back of the cabinet. Easy enough to do.

View attachment 226563

Blimey why so much wiring and are those contractors?

very neat.

Welderpaul · Apr 28, 2020

Brad93 said:
Blimey why so much wiring and are those contractors?

Don't you start too

Brad93 · Apr 28, 2020

Welderpaul said:
Don't you start too

Haha

i assume the contractors are for the limit switches/e stop if a cover is opened.

how does that work with the vfd? That’s always confused me, makes e stops complicated.

interested as my Harrison 140 had all the e stops and limit switches wired in sequence and one of them was bad but I couldn’t tell which. It needs rewiring really and I may put a VFD in there. I’ve got three phase already though so it would only be for slow speeds and the jog function really.

Hopefuldave · Apr 28, 2020

Mine's full of contactors*, and a VFD...

If you're going to run the motor below about 30 Hz or so it's worth fitting an external fan for cooling, one of the contactors is for that - the ABB VFD I use (and many others) can have one of its relay outputs set to open/close with a "supervisory frequency", mine's set to OPEN above it when the motor's own fan is moving enough air, so it cools when stopped or running slowly. Reminds me to switch off, too

A plus with the VFD is the braking/quick-reverse function, handy for tapping etc. - I added some hefty braking resistors from a nice Chinese gent on EvilBay.

Dave H. (the other one)

* Main incoming power (with big red mushroom labelled "PANIC" by the door); incoming power to lathe, power to spindle VFD; power to suds VFD; power to motor fan; power to low-voltage worklight; pair of small relays for suds "logic" flip-flop (suds button push on - push off); accessory feed...

Agroshield · Apr 28, 2020

Brad93 said:
...all the e stops and limit switches wired in sequence and one of them was bad but I couldn’t tell which.

You can continue to have them in series, but bring all the wires to a common point and then it is easy to test which one in the chain is bad. More wiring but much simpler troubleshooting.

brightspark · Apr 28, 2020

daedalusminos said:
The guy was also selling this Myford Super 7 at a very sensible £750

View attachment 211170

snap that up as well its got the gearbox :laughing:

daedalusminos · Apr 28, 2020

Welderpaul said:
I've just let one into the back of the cabinet. Easy enough to do.

Blimey that was 5mm thick steel - 2 slitting discs later and I can get on with the actual wiring

Welderpaul · Apr 28, 2020

daedalusminos said:
Blimey that was 5mm thick steel - 2 slitting discs later and I can get on with the actual wiring

Yep!

Paul in Wiltshire · May 22, 2020

daedalusminos said:
Whilst I'm waiting for the citric acid to do its stuff on the gears of the apron I thought I'd have a go at 3D printing the apron bellows. This is the first attempt, will need some tweaking but might just work.View attachment 217573

Any chance you could share the 3D model of the bellows? Only for my own use. I was going to knock up a model based on the drawing of the original on the Harrison group, but why reinvent the wheel? I have a 3D printer, what TPU did you use?

I currently have a steering gaiter in there, which works, but can some times spring the lever back to engagement, not ideal when you disengage near the chuck.

daedalusminos · Jun 22, 2020

Got the Huanyang VFD wired up how I wanted - spindle brake for apron lever, coasting for foot brake. Took a little ingenuity with the VFD settings/features but seems to be working fine...fine that is after finding I was missing a VFD feature.

Video here explaining all.

Shox Dr · Jun 22, 2020

Neat installation. Have you had it running at 2500rpm a few times yet :sheep:

daedalusminos · Jun 23, 2020

Shox Dr said:
Neat installation. Have you had it running at 2500rpm a few times yet

Yes no problem at 2500 (after I'd changed/tensioned the belts) though the braking (actually controlled deceleration) struggles and results in an over voltage error on the VFD - could be resolved by lengthening the ramp down or fitting a brake resistor.

daedalusminos · Jul 25, 2020

I eventually got round to documenting my Huanyang VFD install featuring spindle brake. Photos of the install posted previously, schematic attached with plenty of notes and VFD parameter settings.

Anyone considering this install should verify their VFD open collector outputs function per the video previously posted.

daedalusminos · Oct 1, 2020

Nice little addition to the M300, a new old stock boxed Cutler Hammer 3 arm Lo-Vo Lite circa 1978 I believe.

Brad93 · Oct 1, 2020

daedalusminos said:
Nice little addition to the M300, a new old stock boxed Cutler Hammer 3 arm Lo-Vo Lite circa 1978 I believe.

View attachment 253447
View attachment 253446

That’s mint. Identical to mine on the Harrison

scottmk1 · Oct 1, 2020

daedalusminos said:
Nice little addition to the M300, a new old stock boxed Cutler Hammer 3 arm Lo-Vo Lite circa 1978 I believe.

View attachment 253447
View attachment 253446

Where did you find that?

daedalusminos · Oct 1, 2020

scottmk1 said:
Where did you find that?

Lucky find at a local garage sale.

grim_d · Oct 3, 2020

Brad93 said:
Haha

i assume the contractors are for the limit switches/e stop if a cover is opened.

how does that work with the vfd? That’s always confused me, makes e stops complicated.

interested as my Harrison 140 had all the e stops and limit switches wired in sequence and one of them was bad but I couldn’t tell which. It needs rewiring really and I may put a VFD in there. I’ve got three phase already though so it would only be for slow speeds and the jog function really.

The vfd has transformed my l5, especially when metric screwcutting.

Harrison M300

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Unlikeable idiot.