ML 7 DC motor powered leadscrew ?

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ML 7 DC motor powered leadscrew ?

This topic has 22 replies, 15 voices, and was last updated 15 March 2017 at 11:26 by Jon Gibbs.

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31 January 2017 at 14:23 #281483
Sid Wittmann
Participant
@sidwittmann87831
Hello everyone. I recently bought a mostly complete ML7 and I'd like to power the leadscrew with a DC motor for fine feed. I don't have any requirement for threadcutting so it'll likely be a permanent fitting.

The question is, what kind of DC motor and speed controller should I buy ?
Ebay is chock full of Chinese DC motor controllers, but I am heartily suspicious of the quality and sometimes the safety of electronic products coming from that corner of the world.
I can follow schematics well enough to build my own controller, if someone has an idea of what might be suitable.
Also what sort of motor should I consider ?
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31 January 2017 at 14:23 #31878
Sid Wittmann
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@sidwittmann87831
31 January 2017 at 18:12 #281564
oldvelo
Participant
@oldvelo
Hi Sid

"Also what sort of motor should I consider".

A 12 or 24 volt DC wind screen wiper motor is a good place to start and a PWM DC Speed Control from that corner of the world.

My limited experience is using them for the power feed on A lathe and a Mill drill plus the oil pump on the lathe.

http://www.kbelectronics.com

http://www.surpluscenter.com/Electric-Motors/DC-Gearmotors/ May be useful place to start.

Eric
31 January 2017 at 18:55 #281574
Michael Gilligan
Participant
@michaelgilligan61133
Sid,

If it's seriously going to be permanent fit and frequent use … you might consider something from the Parvalux range: **LINK**

http://www.parvalux.com/products/dc-motors-and-geared-motors

Not cheap … but excellent quality; and they do turn up second-hand, if your wallet is cringing at the thought.

MichaelG.
31 January 2017 at 19:54 #281587
Brian Oldford
Participant
@brianoldford70365
In this day and age you could even consider a stepper motor using elements of http://www.jeffree.co.uk/pages/ml7-cnc/part-1-files/myfordcncpt1.htm
31 January 2017 at 20:02 #281590
Sid Wittmann
Participant
@sidwittmann87831
Ta very much.

I wish that there was a company like Surpluscenter in the UK. Maybe there is ?

The motor will be a permanent fixture, but even allowing for the fact that I bought the ML7 for much less than the going rate I have to add the leadscrew motor on a budget, unless I want to continue eating beans on toast for the next few months

I've seen the Tony Jeffree CNC link. It looks great, but I know nothing about stepper motors. I'd like a minimum of complication. Just a switch that does ForwardOffReverse and a speed control would be fine.

Edit – just found a brand new Parvalux 10w 24DC motor with 139 rpm planetary gearbox on Ebay for £25 – does that sound like it'll work OK ?

Edited By Sid Wittmann on 31/01/2017 20:08:56
31 January 2017 at 20:31 #281605
not done it yet
Participant
@notdoneityet
There are plenty of u-toob videos on the topic. Enough to give you some inspiration, I would think. Just avoid the downright dangerous examples (open gears rotating is not the best idea!).
31 January 2017 at 21:30 #281623
John Haine
Participant
@johnhaine32865
That motor sounds reasonable. You can buy an MFA speed controller from Maplin, it's rated at 15 volts but I think you can run the motor output through the motor to a 24 volt supply but supply the electronics with 12 volts as it uses a simple MOSFET output stage. The Maplin part number is rn41u.
1 February 2017 at 12:14 #281726
Sid Wittmann
Participant
@sidwittmann87831
That should get me going then….thanks
1 February 2017 at 17:16 #281781
Seafax
Participant
@seafax
Posted by Sid Wittmann on 31/01/2017 20:02:53:

Edit – just found a brand new Parvalux 10w 24DC motor with 139 rpm planetary gearbox on Ebay for £25 – does that sound like it'll work OK ?

If it's the one I think it is I use one as the feed motor on this machine:-

Youtube video does not seem to want to embed click this to view

Edited By JasonB on 01/02/2017 17:45:07
1 February 2017 at 18:57 #281793
Muzzer
Participant
@muzzer
Posted by Michael Gilligan on 31/01/2017 18:55:19:

Sid,

If it's seriously going to be permanent fit and frequent use … you might consider something from the Parvalux range: **LINK**

http://www.parvalux.com/products/dc-motors-and-geared-motors

Not cheap … but excellent quality; and they do turn up second-hand, if your wallet is cringing at the thought.

MichaelG.

I see they supply brushless motors, which clearly require a controller / drive to make them work. Indeed, they talk of "the controllers we supply", yet on their website there doesn't appear to be any mention of such products. Is it just me or is this one of these annoying companies that can't organise a simple website to describe their fairly limited product line?

Murray
1 February 2017 at 19:12 #281798
JasonB
Moderator
@jasonb
Controllers from page 14 of catalogue
1 February 2017 at 19:38 #281805
Muzzer
Participant
@muzzer
Where did they hide that? There was me expecting to find it in the "Products" heading rather than in the footnotes under "catalogues". As I said, rather a bizarre way of "selling" your products!
1 February 2017 at 19:58 #281807
Swarf, Mostly!
Participant
@swarfmostly
Hi there, all,

Reverting to windscreen wiper motors for a moment, adapting one of those to a continuous rotation function means disposing of the wiper blade waggling linkage.

I've never actually held one in my hands but I've wondered whether a side window raising/lowering motor might be simpler to adapt. They're obviously reversible. How do they compare, power-wise and mechanically?

Best regards,

Swarf, Mostly!
1 February 2017 at 20:16 #281810
Seafax
Participant
@seafax
Posted by Seafax on 01/02/2017 17:16:08:

Posted by Sid Wittmann on 31/01/2017 20:02:53:

Edit – just found a brand new Parvalux 10w 24DC motor with 139 rpm planetary gearbox on Ebay for £25 – does that sound like it'll work OK ?

If it's the one I think it is I use one as the feed motor on this machine:-

Youtube video does not seem to want to embed click this to view

Edited By JasonB on 01/02/2017 17:45:07

What was the reason for editing this and creating the false impression that it hadn't embeded properly JasonB?

Col.
1 February 2017 at 20:21 #281811
JasonB
Moderator
@jasonb
It was just showing as a black box not as it should, I tried getting the Embed code direct from youtube and same problem, it usually comes up about 3 lines long but I could only get one and a bit lines.

No false impression, it did not embed.
1 February 2017 at 20:48 #281818
Neil Wyatt
Moderator
@neilwyatt
1 February 2017 at 20:48 #281819
Neil Wyatt
Moderator
@neilwyatt
I have the power!

(It takes ages to load, but does start eventually)
1 February 2017 at 21:32 #281836
Seafax
Participant
@seafax
Ok, thanks JasonB, I had played it back immediately after posting to verify it though so I've no idea what the cause could be.

Col.
14 March 2017 at 19:46 #288822
Nick Hulme
Participant
@nickhulme30114
Posted by Swarf, Mostly! on 01/02/2017 19:58:06:

Hi there, all,

Reverting to windscreen wiper motors for a moment, adapting one of those to a continuous rotation function means disposing of the wiper blade waggling linkage.

ESAB did a lot of testing in the 80s and found the most reliable DC motors available were Volvo wiper motors and used them to drive the wire in their MIG welding equipment, if you think about the job they do on a rainy day and how many years they last I'd say you've made the right decision

Door window motors are similar but smaller and not designed for 100% duty cycle applications.

– Nick

Edited By Nick Hulme on 14/03/2017 19:46:57
15 March 2017 at 10:42 #288901
Ian S C
Participant
@iansc
I use an old Lucas wiper motor on my milling machine table. You can knock the origonal spindle out of the worm wheel, and fit an extended spindle, on this you can fit your drive system, mine is a sprocket for a bike chain.

Ian S C
15 March 2017 at 11:22 #288909
Hopper
Participant
@hopper
You might also be able to use an old battery-powered pistol drill, running on a fixed 12 volt or 14 volt supply and using the original trigger unit from the drill as speed controller, rigged up to an eccentric for control.
15 March 2017 at 11:26 #288910
Jon Gibbs
Participant
@jongibbs59756
Sid,

Have you seen the fine feed arrangement Martin Cleave came up with for his ML4?

If you just relocate the banjo to a lower position for the motor drive onto an aligned pinion gear it still leaves open the possibility for thread cutting and you can also use the leadscrew handwheel if you need it. Here's a bodge I knocked up to test the idea and it worked ok but my motor was restricted to fixed speed only which proved too inflexible.

Hopefully you can come up with a better idea.

MrPete222 on YouTube has a motor driven leadscrew on one of his lathes but I can't help thinking that the leadscrew handwheel is too handy to make obsolete for me but we're all different I suppose.

HTH

Jon

Edited By Jon Gibbs on 15/03/2017 11:27:00
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