Member postings for lee hawkins 1

Thanks everyone. I appreciate the advice

I thought about all the times , if only I had a rotary table, and there was quite a few times in the past, so I went ahead and bought the Hofmann, it's in such good condition and operated so smoothly., I had to buy it for the price,

You hear some say , I have a rotary table and I hardly use it , But the point is they do own one

Hello all,

I have the chance to buy a 10'' rotary table, it has a name plate on the side says Hofmann, it's in very little used condition, it still has all it's paint apart from a couple of scuff marks, excellent condition, it works so smoothly, with no backlash that I can detect , table is unmarked,

I have never used or own a rotary table, I only do hobby stuff but been told that I can buy it for £150 and your getting a bargain at that price

Hello

How about these

stores.lathes.co.uk/parts/fobco-7-8-10-8-drill--drive-belt

Michael,

No need for sorry mate, I appreciate any help I can get, I also scoured the internet for info on this particular spindle , but with no luck, I have rebuilt it now, but I not sure about that machined tube I mentioned moving about inside

Regards

lee

Thanks for the replies,

I looked at the drawing of the spindle in the link that MG posted, it's not very close to the one I have.

What I have is a spindle casing roughly 101mm in diameter , 230mm in length with a wall thickness of 9-10mm,

inside the casing at the front , is a recess to take two press fit bearings butted up together onto a shoulder , they are NOT angular contact bearings, which did surprise me also, but they are deep groove bearings, 30x62x16,

At the rear of the casing is another recess with a should , but the Single bearing , also a deep groove bearing 25x52x15mm does not directly press in there, instead it has what I would call a carrier, that the bearing is press into.

This carrier is a robust sort of component , imagine a extra thick walled piece of tube about 50mm long , it is machined out to carry the press fit bearing, all around the perimeter of the carrier is holes, in those holes are springs that stick out,

Down the outside of the carrier is a slot, that locates on a pin that protrudes to the inside of the casing, you push the carrier into the machined recess, tight but it is a smooth fit , you do this after you have fitted the front bearings into the casing ,because of the design of the spindle shaft.

The spindle shaft itself , has a journal machined on the front to carry just one of the front bearings, remembering there are two pressed into the casing.

Here is another bit of a head head scratcher for me. There is two other journals on the spindle shaft, to carry a machined thick walled tube , it moves very smoothly on those journal , it's not pressed on , when the spindle is assembled everything done up, when you shake the spindle , you can here it moving up and down inside, I thought it was a spacer to push up against the bearings for preload, but it does not go up to the bearings ,it cant reach them, it's about 1/8 inch short, Is it there to stop vibration in the spindle?

thanks

lee

Hello

I have dismantled a Jones and shipman Internal Grinder spindle, I am going to rebuild it with new bearings, But I am a bit confused, at the rear pulley end of the spindle it has one Bearing, at the front of the spindle it Has two bearings mounted together, but what has confused me , is that only one of the bearing is actually fitted to the spindle, they both are press fit into the body of the spindle casing .

Anybody have any ideas

one thing I did think of , is it to do with radial load and Axial load?

lee

Ok Clive , thanks for the advice, it is appreciated.

Not sure I would be able to find a large XY table for a couple of hundred quid though? anybody send a link for where to buy one at that price

Kind Regards

lee

John,

Thanks for the advice , most appreciated, this is reason I posted on here to hopefully help me come to the right decision as to what to do with the machine

Regards

lee

Clive, out of interest, what part of this machine is lacking the strength to perform the job of a milling machine,

It has a very heavy large diameter rise and fall column, at around 4 3/4 inch , under the control a heavily built bevel gear, large diameter acme threaded bar going through a large Bronze nut, easily the size you find under the knee of a Bridgeport, the base everything sits on , is a very very heavy cast iron lump, the cupboards part, is made of heavy gauge steel ,the top has a steel plate welded on , got to be nearly 3/4 inch thick,

The spindle I can change, I do have a mini lathe headstock with taper roller bearings fitted, done that modification couple years back, making a milling machine out of it will have some head scratching fiddley parts , but with this machine most of it is nearly there.

Regards

lee

Edited By lee hawkins 1 on 12/09/2021 19:11:52

Thanks for the replies,

What come with it is.. the Center support Brackets , radius Grinding fixture in it's own metal box , a universal Head, and cutter grinder bodies for the air bearing, which was not there,, but there was various other brackets ,don't know what they are for though, the cutter grinder bodies, that I would call mandrels, have their own metal box and it's a full set ,with the collets but there was no Air bearing in the box , or maybe it had it's own box , I will have to have a good search around in the shed

Clive , where I work, we mainly deal in CNC machines,, the cheapest machine in there go for about eighteen grand, all the way up to tens of thousands, the older stuff ,couple of hundred or thousand are from machine shop clearances, the place shuts down, and we have to have everything in there, the older stuff can get buried sometimes ,when nobody make inquires , can stay there for a few years, my boss concentrates on the high price machines high profit margins ,pay the rent and our wages, he does also like old machines and will have them in the showroom with the newer stuff , he has a schaublin 102 on its original cabinet ,in real nice condition, he has been offered money for it, but he wont sell it.

Back to the March MK3 cutter grinder, do I restore it to back to showroom condition, or do what I was going to do , make a milling machine out of it?

Thanks

lee

Hello All,

I work for a machine tool sales company, second hand a new,

In the back of one of the sheds I found a , March MK3 cutter grinder, 7-8 years back, it was taken in part exchange for a new machine, it was put in the shed and there it stayed, until I came across it , asked my boss what are you going to do with it, I could not believe it when he said it's all going for scrap, and said if you want it ,take it, it's in quite good condition, not overly rusty , I had break it down make three trips to get it home, very heavy for a relatively small machine,

I was thinking on converting it to a milling machine, but the more I look at the machine, it would seem a shame , so I have decided it needs to be totally restored.

There seems to be loads of information regarding the Clarkson MK1 and MK2 cutter grinders, but hardly anything on the March MK3, the one I have

what sort of Price do they fetch?

Regards

lee

Ha ha no worries Ian

Thanks

lee

Ian,

Iron Bushes, only place I can find these are from companies located in India, do you know Where i could buy these in the UK

or what about these  https://www.bearingboys.co.uk/BU-Type-Bearings/MB2550BU-Split-Bearing-Bush-14894-p

Thank

lee

Edited By lee hawkins 1 on 03/03/2018 12:54:22

Edited By lee hawkins 1 on 03/03/2018 13:13:22

Thanks MichaelG

Will do.

Thanks everyone for your ideas

I am no professional engineer, but do like to do things that make a proper job, So I have opted for the oilite bronze bush, these here http://www.ashleypower.co.uk/store.php/products/amc253550-metric-plain-oilite-bush

Ive been having a study of these bushes, what I have learnt , is that these bushes need to be pressed in so as to close them down to get them to fit the shaft, so when you order them at what I need 25mm id , they are a fraction over that size Is this correct ?

Thanks

Lee

Hello all

Been a member on here few years now , not posted much for a long while, few years I recon, please dont feel like i only want to talk to you all, is only when I need something.

I have this project, building longer rails on a chop saw, I have the rails, they are 25mm hardened steel shafts, I was thinking on using bronze bearings, but found some mild steel thick wall ferruls 50mm long 40mm od exact slide fit 25mm id

Will these mild steel ferulls/bearings be ok for wear on a hardened steel shaft

lee

Mick, Hopper

Yep!

I used block of wood to press out old bearings, a piece/splinter of wood managed to stick it's self to the bearing seat, cleaned it out, now perfect!

Thanks

lee

Hello

I decided to fit some new bearings to my mini lathe headstock . so I went for these, 7206 B 2RS Angular Contact Ball Bearing 30x62x16

These bearings fitted great. I have not given them any sort of preload for the reason being that I have not even fitted the locking nuts and On turning the spindlle there seems to be a slight binding as though there is too much preload.

When I turn the spindle, it turns kinda smooth but you can sort of feel the spindle click around with the rollers in the bearings

I have never had much to do with angular contact bearings, maybe these bearings fit differently

appreciate any advice

Thanks

lee

Brilliant!

Thanks for all the advice,

Like I did say, I had a good idea how to do it, my thoughts were going the same way as Gordon w' mentions , it's good to run it past other people with the same interest and experience, makes me feel better

Rod, thanks for posting,

Ketan' mention how little preload is needed, I can understand that, but you still got to get preload on those bearings

Norman, I like the milling machine, good bit of ally in there

Kind Regards

lee

Edited By lee hawkins 1 on 16/10/2015 07:10:30

Hello

I do have an some sort of Idea how I could do this, but not sure it's the right way, or someone come up with or knows of a better way

I have got a lathe head stock casting, but will be fitting my own h/t steel shaft, 1'' Dia , the Bearings I am fitting are Taper roller bearings, the shaft does not have threads to fit locking rings/nuts ,

Without me having to cut threads, How can I go about Preloading the taper roller bearings

lee