Todays update from Bodgers Lodge

Just set a job up on the lathe a few minutes ago ready for Monday morning, bitch of a job. Took about 15 minutes to set up but the bit that's holding it took me a good hour and a half, never though to get pics as it's a job I do a far bit but this stator is far far bigger and heaver than any before [ I think they are testing me !! ]

On Monday I'll photograph it in reverse and then post on it. OK this is a largish rotating stator off a big out runner motor but the method applies to any scale.

> Ladbroke Grove

Not another hairy biker Hawkwind fan?

Neil

Damn, forgot I needed to update the inverse rotor post but it will have to wait whilst I find the memory stick.

In the meanwhile this fell on the floor today.

No idea what it's off the the link goes onto a geared motor and drives the yoke. Problem is it was fitted with some special needle roller bearings that ran direct on the 28mm shaft of the link. Link is a steel casting and the pin is hardened and it's not in too bad a condition but 28mm bore bearings with an OD of 60mm are not available.

Add the this it wasn't spotted in time has has walloped the yoke a few times and there is one decent crack into the bearing housing.

So bore the pin out, make a new pin out of EN hardaswhitchestits to 30mm instead of 28 and press in.

Slap some weld onto the yoke, wait for it to dry and bore out to 62mm for a standard bearing.

Looks passable to me so must be brew time.

John, if the floor was clean enough (or should that be clear enough?) I could sit there "all day learning by watching old Bill" or really just John. Cheers

HI all,

can someone tell me what the correct name for " EN hardaswitchestits" seems like something quite handy to know...

is there a standard list to describe the common use's of the EN types of steel....

great posting, amazing work....

thank clogs

Well Fridays job and not today and not that relevant unless you have a 12 tonne tablet stamping press in your workshop.

Just thought it looked pretty.

It's a face cam that bolts onto the start of a circular cam that raises the dies up and another set about it pushes them down. Quite slow moving about ? 60 revs per minute but they take quite a load. No spares, machine must be wartime or even pre war.

Other than the base and end joint there isn't another straight line on it anywhere. Could have chopped them out of a big steel ring 260mm in diameter but terrible wast of metal plus still need to do the face which is made up of 2 curves, so carved it out of two pieces of 35 x 35 x 75 on the CNC. Total machining time 38 minutes per piece but that doesn't include prep work, programming or fixturing although by a fluke the tapped holes in the base lined up with one of ARC's 20 x 40 x 80 blocks.

Last week on the " What did you do today ? " post I put some pictures of of some Bridgy rotors, nothing special about them do absolute loads but in one of the pictures were two armatures out of a very old series fork truck.

Even though they are old they love these are they have no electronics fitted just a few big relays and therefore cheap to maintain. Only problem is they use an old series motor and hydraulic system and they are getting quite scarce but can be repaired electrically but the mechanical drive is a problem.

They use a 25 vee spline drive, nothing else uses this and modern drives are involute stub splines anyway and not vee.

Not particularly clear as they were just included in a shot as opposed to being photographed specially. The one on the left has a ring of original spline at the end but inside it's all stripped out. Right hand one is completely gone.

So swing the slotting head round on the Bligeport, fortunately I had the foresight to fit the 4" riser off the old machine as by the time a 12" rotatry table and 8" 4 jaw chuck is fitted it's getting 'real' close.

Slotting head is off a Beaver but modified to fit this Warco VM40 which is bigger than a standard Bridgy, even a genuine Bridgy slotting head won't fit one of these but these Beaver heads are far heavier built and can be modified to make fit.

Rotary table is powered by a Steve Ward rotary indexer so 25 divisions are a doddle.

Only needed two but did eight so got a few spares for next time.

Armatures bored out, splined bushed pressed in and the plain ring in front of the fan splines is where it was welding into position. Ends case hardened and polished and they went out at dinner today.

Next six should be a lot easier to do

Edited By John Stevenson on 29/04/2015 21:46:17

I see that Scottish lubricant play a usefull part in the workshop from the pictures attached!

Well after a nice quiet few days at Harrogate it was back to the grindstone, or was that Harrogate all over again ?

Knew this job was coming in as they tried to bump it in the week before, done them before as well. Simple job, sprocket needs boring out to 32mm for a bearing fit and thinning down to 16mm total which means a lump off the boss.

Before I drilled out to 31mm then parted the bit off on the boss, quite a long job as there are 100 of these to do and probably took a couple of tips as well as the boss is 65mm in diameter. Then finished up with some nice heavy washers / spacers but with a 31mm hole.

So this time decided to remove the boss before drilling so I just had the 12mm pilot hole in it and that's 100 gear blanks, free of charge - thank you, but parting this off is even more work.

So took the chuck of the lathe, clamped it into the bandsaw and sawed the boss off. No tips to break and far, far faster as the saw takes 1 minute 31 seconds to cut the boss off.

That's an 8" chuck in the bandsaw but no reason why it could not be a smaller chuck in a hobby bandsaw, or donkey saw. Threaded bar is fitted to the rear of the vise jaws to stop them tapering with the work all at one end.

Took all of the afternoon to cut these, now got 20 finished.

Only 80 to go

Finished all the sprockets today, real boring day, did I mention I hate production work ?

Anyway got a right good job in this afternoon I can really get me teeth into or would have it if had any teeth left.

Two stage epicyclic gearbox that drives a turntable at the bottom of a special fork truck. The mast can rotate thru 180 degrees so it can pick off shelves whilst the truck is stationary. Real special, mast is 9 metres high in 5 stages and equipped with cameras etc.

First stage on the plate is OK but on the output stage all the pinions are toast. Fortunately all the pinions are the same except the first stage has a smaller bore but possible to get decent measurements.

And the measurements proved what I suspected when I saw these, that they are special, note the fat teeth. So that knocked nipping up to HPC gears and buying three off the shelf gears - damn.

20 teeth but cut on a 21 PCD, so turn a simple bar up to the OD and throw it on the 'gear hobber' which is thinly disguised as a Victoria U2 universal mill.

And ten minutes later we get a stick of gears.

Drilled, reamed, parted off and a tad of surface grinding we have three new gears.

So just a tad less than an hour but in all fairness they now have to go over the road to the hardening shop which will have to be tomorrow now but they can't get a new turntable bearing until Thursday anyway.

A new gearbox from Mitsubishi is £2,200 and 3 week wait so should have some reasonably happy bunny's.

So where were you at the show, cos we could not find you. It's not unusual as we have a habit of missing things.

regards Martin

He was hiding behind the Lunar lander

**LINK**

Ketan at ARC

Oh the memories!

Added to favourites!

Ketan, I demand compensation, just wasted 30 minutes of my life trying to land an unimpressive spacecraft on a totally inadequate representation of a lunar landscape - how dare you inflict these forgotten artifacts on an innocent human being !!!

Run of the mill job in today, increase a thread in a rod end yoke from M28mm x 1.5 to M30mm x 1.5. Enough meat to do it as tapping size for M30 x 1.5 is 28.5 so above the present thread.

What might be of interest is how to locate the thread.

Quick shot of what we are talking about.

Existing yoke sat on top of the chuck for the picture. As I didn't have a M28 tap I turned a slug up with two different diameters, 26.55 which was a nice snug fit in the threaded hole and the other 16mm to fit in a tailstock chuck.

So the whole assemble was fitted to the chuck first, offered up to the jaws and just nipped. Tailstock chuck was then removed leaving the slug in the yoke and it was then possible to clock up on this slug.

Slight tweak to get central and then fit the boring tool.

This followed by the infernal screw cutting tool and one down, two to go.

Note the bed stop set to prevent the boring or screw cutting tool hitting the bottom of the hole.

This method can be used to hold any irregular shape like a cylinder or anything with a hole in it.

Neatly done, John

MichaelG.

.

P.S.

Good to see you using a four-jaw

[re. your snipe on the recent Rotary Table thread]

Oh John, Oh John Where forth art thou? Leave the little filly alone and post something, We are wondering what's going on. Too many good deals to stop and let Us know?

That takes me back 35 years to a DEC GT40 which had a vector display. Think it had a PDP-11 processor, but might have been an LSI-11. Lunar Lander only had one mountain IIRC, but if you flew fast enough you could go right through the mountain and land safely on the other side.

Oh the waves of nostalgia... that was the time that the National Coal Board released a version of Space Invaders ported to Basic.

Steve

Hi Steve,
The CPU was a PDP11-05. I used to repair these and other PDP11s when I started working for DEC in 1977. I remember crashing the lander on "the only Macdonald's" on the moon. The game was quite a good diagnostic for testing these devices.

Les.

> if you flew fast enough you could go right through the mountain and land safely on the other side

Early example of a quantum computer

If you dare download the file at the bottom, of this page. (safe link).

Neil