Hi Rob,

Are you trying to mount it on the cross-slide? It should bolt onto the chuck end of the saddle using a tapped hole there. The 3 inch height will be correct then.

John

Does this help? The tapped hole on my ML7 is approximately in the centre.

Edited By John Baguley on 16/07/2013 16:49:42

Rob

If you are dissatisfied with the one you have bought you can make your own. College Engineering sell the castings/materials and it is an good exercise in some simple machining. Here, as they say, is one I made earlier! It was originally for my ML10 and you may note a piece of M/S fixed to the bottom to allow for the increase in centre height when I upgraded to a S7. The downside is that I think that the cost of the casting & materials is about the same as the finished item from one of the suppliers mentioned. On the other hand think of the satisfaction in making it yourself!

Hi
I agree with Rob why not make one ?
Nobby

Edited By JasonB on 17/07/2013 12:25:34

Looks like someone beat me to it but I've taken it down a bit more, just click the image if you want to see it larger.

J

Rob,

The ads down the middle of the screen are only on my Ipad3 and not on my P.C.

Len. P.

Mine is 1/4 BSF not UNF There is a different thread count

Roy

Hi Rob & Guys
Try various screws until one screws in . MY S& Mk, 1 is 1/4 BSF The rule us toolmaker's used to use was Whiworth in cast iron and BSF in steel I dont if you can in this case but larger threaded hole you can press plasticine into half the hole then check form with using a thread gauge . Having trouble uploading photo,s or has it already been said ? Note M6 would screw in mine as well

Nobby

Rob,

For the information of others.

1/4" BSF is 26 tpi 55 degree thread angle whereas 1/4" UNF is 28 tpi with a 60 degree angle. They are thus NOT interchangeable. What you have done by running a UNF tap through a BSF hole is to produce what is called a "bastard" thread that will now be weak so please be careful when tightening the fixing bolt as the internal thread will strip easily.

Myford have never used Unified threads just BSF a few BA and some metric thread to hold the head stock down (M8) and some to fasten the gearbox to the head stock (M6).

The whole idea of the unified thread system was to overcome the difficulties found during WW2 with the incompatibility of British threads with American ones.

It was a failure because it only "helped " with Whitworth threads (except 1/2&quot not BSF. In the 1960s the motor industry adopted Unified threads which cause a lot of confusion particularly with spanner sizes. Often spares had to be duplicated to accommodate vehicles with common parts but with different thread systems. Frankly the whole thing was a shambles. Thank goodness the metric system was adopted soon afterwards and bought some standardisation back into the industry.

America still persists with its own thread systems for many domestic applications although metric fasteners are very slowly being adopted. I do not think the Americans ever accepted or used the Unified system – they just carried on regardless.

Eric

Might be best to drill it out and tap it a size larger, and increase the siz e of the hole in the steady.

There can be a lifting strain on travelling steadies, so better safe than sorry (today's trite comment!).

Or fix the steady on and give it a tug!!

Phil