Search Results for 'MyFord ml7 clutch'

[David Clark 13Participant @davidclark13]

Hi There

It would need the same capacity as a Myford ML7as a minimum including the gap bed.

Alternatively, no gap and 125mm centre height.

Poly Vee belt drive. (Geared head to noisy in home environment.)

Lever or capstan feed tailstock.

Tee slotted cross slide.

Screw on chuck with locking mechanism so lathe can be run in reverse.

 

Optional

Single tooth dog clutch for leadscrew.

Screwcutting gears for imperial and metric.

Variable speed drive.

Back gear.

Bed stop as standard.

regards David

 

 

 

[adyParticipant @ady]

It’s one of those things that makes you wonder why no one else has thought of this in the last 100 or so years ?

—————————————

 

That’s actually a great question.

 

My own answer is this:

 

Reversible motors? who made them?

Even a dog clutch was virtually non-existent, when did the ML7 have one?, Drummond M series lathes were made by Myford and were for Destroyers in WW2 and were expensive but when your country is at the edge of armageddon who cares about the expense.

 

So reversible motors were almost non-existent and even dog clutches were a luxury.

 

Sparey never said a thing about dog clutches in his amateurs lathe, not a button.

[Jerry JCParticipant @jerryjc26635]

Hi,

I’m pretty much a beginner but have just bought an old Colchester Chipmaster lathe, having sold my Myford ML7.

The lathe still has a working variator fitted with a single phase motor.

 

The Chipmaster was shown to me working when I collected it but when I tried to use it at home, with the clutch lever engaged, the spindle barely rotated in low speed range or in high speed.

The gears apprear to be engaging correctly but the clutch apprears to need reassembly, adjustment or repair ?

 

Embarassingly, my problem is I unscrewed the knurled collar and then reassembled it perhaps the wrong way round… In any case I can’t manage to get it unscrewed again. (very red face!)

 

Is there anyone out there who can help me please?

I am located near Maidenhead / High Wycombe area and if there’s anyone nearby with expertise or familiarity with this lathe, I would happily pay you to come and take a look and hopefully get me back up and running.

 

Many many thanks for any assistance which would be gratefully received.

 

Jerry

[adyParticipant @ady]

An amazing machine for its size, you won’t ever regret getting one.

 

The back end looks pretty bare though, have you got any bits and bobs for it?

The bar under the leadscrew is a dog clutch(my one is a single tooth so threading is a doddle), even the 1946 ML7 didn’t have one of them things, I reckon the war office picked them for the war effort(destroyers mainly I believe) because of details like that and made myford their WW2 production base while Drummond focussed on the production of gearmaking machines.

The v-belt pulley versions are easy peasy if you use that linked v-belting, it’s not cheap but it lasts a long time.

 

The other important bit is the backgear, hopefully yours is ok.

The backgear is an essential part of the machine.

 

There’s a yahoo group full of Drummond nutters (drummondlathe) who know the machines backwards, join it and you can download various useful files.

 

These machines are 70+ years old and yet they can still do good work, that’s how good they made them.

I don’t run mine too fast, up to five hundred rpm? probably less.

Their real strength is stiffness and coping with torque, medium to low speeds IMHO.

 

You can see mine in my profile and some knobbly 45mm construction bar it munched through.

 

[_Paul_Participant @_paul_]

Hi Nic,

 

If that’s its original (hollow) tailstock the machine is an earlier model and may well have white metal headstock bearings, these aren’t a problem unless you intend to run high speed a lot (beyond the machines original design speeds) which is easy to do with an Inverter setup like mine.

Later ML7 versions had a hardened spindle and phosphor bronze bearings high rpm is not a problem with these.

The long cross slide is a boon as you can mount a rear (parting off) toolpost and leave it on there.

Another extra it has is the handwheel on the leadscrew again very useful.

The raising blocks aren’t Myford ones but as long as they are rigid.

Zero able dials are a nice feature I still have the old Mazak ones on mine

I have seen some belt drive clutches but can’t comment on how good they are here’s a link I found some time ago http://www.homepages.mcb.net/howe/workshop%20lathe%20%20tools.htm

Run the carriage up and down the bed feeling for any slop/tightness, you would expect some wear with a machine of that apparent age but not so much its really slack at the headstock then jams halfway back up the bed.

Check the back gear for broken teeth a replacement (used) set will cost you about £80, teeth can be easily be broken by forcibly removing stuck chucks using the backgear to stop the spindle moving.

Check the 4 jaw operating screws for damage as the allen type are prone to cracking/breakage and replacements are no longer available.

The gearbox may well have been constructed by someone like you or I I have seen similar designs.

Regards

Paul

[John Stevenson 1Participant @johnstevenson1]

No I have had a rethink and to be honest it’s got to be seven and a quarter.

 

You see one day I was working away and this truck pulls up, driver comes in and says I have a machine for you. Go out expecting an Ink machine for repair [ I used to make them ] and there on this truck is a Myford ML7 on a stand.

 

Where’s it from ? 

 

Ower boss said to deliver it to you.

 

Who’s your boss ?

 

Harrisons Transport.

 

So Mr Harrison has sent it ?

 

No he’s just told me to deliver it.

 

[ Give up at this point as it obvious I’m stressing his brain cell ]

 

So we unload it and wheel it in, looked it over and the ‘stand ‘ is a large MEM switchbox and I mean large.

The lathe is a bog standard ML7 is atrocious condition, EVERYTHING is worn out, never seen a machine tool as bad. I don’t recondition machine tools so unsure where or why it’s arrived. Park it up and wait a phone call.

 

Three months go by, no phone call, leave it another month, still no call so cut the stand up for scrap and park the lathe in a corner stood vertical to save space.

 

Six months go by, no phone call so sell the motor, motor mounting and clutch to needy people. Four years on still no phone call and a few more bits robbed off it so what’s left allowing for condition is only a quarter of a lathe.

 

I often wonder, when I fall over it, where it came from and before anyone claims ownership remember the unpaid rent.

 

Other lathes in no order just for interest.

 

6″ x 30 CVA toolroom lathe

7″ x 40 TOS 360 centre lathe

11″ x 84″ SN50 TOS lathe

Sieg C0 baby lathe

Conect CNC lathe based on Myford ML10

Sieg C4 CNC lathe, prototype, not released in this country.

Denford ORAC CNC lathe

 

Sir John unslotted Stevenson

[John Stevenson 1Participant @johnstevenson1]

About 8 years ago I wanted a new lathe as we were falling out over the CVA, the ML7 was too small and the TOS SN50 was too big for normal day to day work.

 

To cut a long story short I rang TOS to see if they did a medium sized lathe, Colchester’s were too expensive. They did a 14″ swing by 39″ between centres.

Now TOS whilst being  Czech has a good reputation for machine tools.

 

It came delivered to the door, literally, with every conceivable extra, except taper turning which I didn’t want, 4 chucks, two tailstock chucks, two steadies, spare clutch plates, selector forks and cross slide and top slide nuts as standard. All wired up with footbrake, 2 speed motor etc.

 

It cost £5,420 including VAT, £20 more than a bare bones Myford 254 at the time.

 

Tell me how you can justify that difference ?

 

John S.

Model Engineers Workshop Issue 5

[DMRParticipant @dmr]

Ian,
I have SK1711 as original with roller bearings.

I fitted a backup grub screw behind the main one (BSF) to lock the position as I descided it was probably working its way out. No more troubles.

 

Originally (3 years ago) I had slip as I had set it up. descided I was probablly being too soft and it was wearing out the clutch because of slip. the tighter you make it, the more you think the two bits holding the roller bearing in the handle are going to give up, but it all seems OK. Myford still have those bits as they fit the clutched ML7, but not the bearing which can be had from elsewhere anyway.

 

Good luck anyway,

Dennis