Myford hand wheel dial

[egaParticipant @ega]

Got it!

I was having difficulty in reconciling your dial numbering with my recollection of the stroke of the standard arrangement which, incidentally, in my case at least did incorporate a thrust race.

[Graham MeekParticipant @grahammeek88282]

Posted by ega on 21/09/2022 16:53:44:

Got it!

I was having difficulty in reconciling your dial numbering with my recollection of the stroke of the standard arrangement which, incidentally, in my case at least did incorporate a thrust race.

Hi Ega,

The standard Myford thrust race remains, but an additional Needle Roller thrust race has been added. You can see this in John's 3D view, it sits between the Oilite Bush and the Input gear. The Input Gear and the Thrust race actually share the same recess.

This was added to help with ejecting Morse tapers. This was catered for on the original Handwheel with a large contact face. This face had to be reduced to take the Sleeve Gear that carries the Dial.

Fitting the Needle Roller Thrust race on it's own improves the feel, and makes for easier Morse taper removal

I hope this makes things clearer,

Regards

Gray,

[Martin KyteParticipant @martinkyte99762]

All in all I feel that the addition of sensible reading micrometer dials on the carriage and tailstock make a real enhancement to the Myford. I know many prefer to go down the DRO route which I would wholely applaud on a mill but find overkill on a lathe with the possible exception of the cross slide. What I like most about these dials is they look as if they should be there and if you were told that they were a Myford item you could believe it. I have a GHT screwcutting topslide with a larger and lockable micrometer as shown below so the only thing I'm missing is GHT's larger and lockable cross-slide mic. However it's on my list.

Edited By Martin Kyte on 21/09/2022 18:34:43

Edited By Martin Kyte on 21/09/2022 18:36:35

[derek hall 1Participant @derekhall1]

Hi Martin,

I did the GHT modification to my non powered crosslide on my super 7 and it works very well, highly recommended!!

I haven't done the topslide modification as you have done – that's on my list! How did the conversion go?, I see that Hemingway offer a kit of bits for this.

Regards

Derek

[Graham MeekParticipant @grahammeek88282]

Posted by Martin Kyte on 21/09/2022 18:33:57:

What I like most about these dials is they look as if they should be there and if you were told that they were a Myford item you could believe it.

When in the 1980's and I was starting out with my home workshop, I did offer the design of the Handwheel Dial and the Screwcutting Clutch to Myford's, in exchange for a 254, but it was declined. I suspect the cost for them to manufacture such an item would have been mind boggling. Myford, bless them, did make me an offer on a 254 which I could not refuse.

I have over the years been told by several people that the Handwheel Dial was made by Myford's, which is what I was aiming for when I designed the item. There are of course red faces when I say "I don't think so, as I designed it".

Regards

Gray,

[Martin KyteParticipant @martinkyte99762]

Posted by derek hall 1 on 21/09/2022 20:03:45:

Hi Martin,

I did the GHT modification to my non powered crosslide on my super 7 and it works very well, highly recommended!!

I haven't done the topslide modification as you have done – that's on my list! How did the conversion go?, I see that Hemingway offer a kit of bits for this.

Regards

Derek

Pretty well actually. I used the Hemmingway kit as you say. I have to confess to not actually using the retracting action for screwcutting since I made it. Mostly as I don't do that much screwcutting and with tipped screwcutting inserts tend to go straight in which gives me the easy option of widening the cut when at correct depth by using the topslide. I'm sure it will get used eventually especially now I have upgraded my Quorn so I can generate full form threading tools, but the main advantage to me is the larger mic dial. It was an interesting build anyway. I find myself in possession of no less than 3 topslide now and am most of the way through making a 4 way GHT tool post with a spare turret which will use one of them.

regards Martin

[egaParticipant @ega]

Gray:

Man thanks for your comments; those exploded 3D drawings are a boon to those who like me sometimes struggle with old-style ones.

Martin:

My GHT 4 way was made with the help of a bought-in ratchet from Hemingway when his name was Neil! I wouldn't be without it despite the current popularity of QC tool-posts.

[Graham MeekParticipant @grahammeek88282]

GHT's 4 Tool Turrets have served me well over the years.

The one I had on my Maximat Super 11 was also fitted with a self indexing attachment.

It was fitted with two additional face cams which returned the turret to the 90 degree position. This did not mean the Turret could not be set for any angle in between.

The addition of a one way clutch in the underside of the lever meant the turret started to index as soon as the lever was undone.

This a non-self indexing version I have fitted to my current lathe the Emco Compact 5. Repeatability is very good even in this small version.

Because of the inbuilt rake angle on the Tool holders there is no need for any packing. The underside step on the Tool holder means each Tool holder can be removed and replaced at will, with no loss of position. All the benefits of QC but the advantage of 4 tools at my disposal before I need to change.

The Parting blade and Boring tool holders are automatically on Centre height.

Regards

Gray,

[egaParticipant @ega]

For the benefit of anyone inspired to make a GM 4 way it is worth mentioning that they are covered in his book Projects for Your Workshop.

[Martin KyteParticipant @martinkyte99762]

I wanted to make one as I was not entirely convinced as to the rigidity of my quick change TH. So building the GHT 4 way is a bit of an experiment so I can compare one with the other. Apart from being non indexing it does suffer from the ingress of swarf particularly when machining brass which gets between the dovetaily bits and also the cam lock register that sets the hight. Ok I know it's just a matter of routine cleanliness but it does catch you out now and again.

I particularly like the way the GHT rotates on a circular taper keeping it of the face of the topslide. I would lay odds that if Myford owners removed the toolholder from their machines and tested the mating face for flatness most would find something of a bulge around the central clamping bolt as the surfaces get worn away as the toolholder is rotated with more coming off the further from the centre you go. This clearly does nothing good for rigidity and on a Myford you need all you can get.

Don't get me wrong I do get on well with the QC toolholder it's just that reading GHT's comments got me curious. As I mentioned I am the fortunate owner of 3 topslides so I am probably not going to have to actually change a tool that often when I can either change the topslide to swap between QC and 4 way or swap the 4 way turret from tools for steel to the turret with all the brass tools.

regards Martin

Edited By Martin Kyte on 22/09/2022 13:48:29

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