Tom Senior M1 Verticle head

a while back i bought a verticle head in bits (told all there)

i did find a picture from 2010

i think i am missing a sleeve between the gear and the bearing but i can knock one up.

does anyone have an exploded view or a picture of where the bearings and shims go as its a bag of bits?

Have you tried https://groups.io/g/tom-senior/files? There are many files there.

Brian

Is this any good. I had to convert from a PDF to a JPG to manage to upload on here.

Steve.

I don't see any shims on the shaft, or anything marked under the end covers. 

It doesn't make sense exactly, since the central part seems like it should be clamped tightly using the missing tube and the outer races shimmed for the preload. Your spindle is different from the drawing, the gear is offset from the centre. I think the lower race outer is held tightly and the upper one moved to give the preload.

Edited By old mart on 03/02/2021 17:07:36

Edited By old mart on 03/02/2021 17:27:09

The same picture as Steviegtr's hoping for better definition. I got this from the Denford forum, hope they don't mind. There is no sign of any shims for preloading.

Edited By old mart on 03/02/2021 18:04:34

Thanks for the reply if you look at the 2nd picture that I got of the net it says shim? but I do not have one in the bag

Tom Senior seemed to make some changes to their designs from time to time which can be confusing. The drawing does not show the oil seal, for instance, and the position of the gear on the spindle varies. Do you know whether oil or grease is used in the head? If it is grease, then a common lithium high melting point would probably be ok. Moly grease is not recommended for ball and roller bearings, as it can make the surface of hardened rolling elements brittle. I used a double lip oil seal without the garter spring on the TS light vertical R8 conversion along with lithium grease and it overheated. The only solution was to completely remove the inner half of the seal, which was ok with grease and the outer lip keeps the swarf out of the bearings.

The oil seal size is likely to be determined by the shaft diameter. The OD and width will follow from there.

Recently, a friend has upgraded the sealling on his lathe to a lipseal. He had to find a seal which would suit a 45 mm shaft. The Bakelite housing had cracked so we made a new housing. Since 45 x 65 x 10 is apparently a standard size, the housing had a 65 mm bore.

If there have to be seals at each end, it may be that the "wind back" helix, if there is one, will need to be different at one end from the other.

So armed with the shaft diameter and housing bore (in Inches as well as mm ) talk to your supplier of bearings and seals. they should be able to find a standard offering which will fit.

HTH

Howard

The seal which overheated was a common size and I made the housing dimensions to fit it. I thought the overheating was due to excessive preload of the bearings and even resorted to setting zero preload before finding that the seal was the source. The overheating occurred at 2000 rpm which was inside the projected 3000 rpm for the spindle.

Thank you all for the replies the seal cam be seen in the end cap on the far left of the first picture on my original post

Bob

right i have all the parts to rebuild this now except the bolts to hold the 3 Caps on 2 of them have a counter bore and one is countersunk can anyone tel me the bolt sizes and threads please as there was non with it.

Thank you all Bob

TS use BA for the smaller fittings, so you could try a 2BA or 4BA screw in the holes.

Edited By old mart on 17/04/2021 19:53:48

Thats great thank you i thingk i will take the casting to the bolt place that way i know it will be right.

Bob

Morning i have fianly got all the new bearings, seals and parts made to rebuild this head can someone tell me is it filled with oil or are the bearings and gears packed with grease?

Thanks Bob

It is common for grease to be used, unless the seals are very good as it is less likely to leak out everywhere. If you use grease, make sure there is at least 50% air space otherwise the head will overheat. A lithium based grease would be ok, don't use moly grease with ball or roller races.

Thank you for the reply it has all new bearings and seals but i will use grease.

Bob