Todays update from Bodgers Lodge

[John Stevenson 1Participant @johnstevenson1]

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.

[Michael GilliganParticipant @michaelgilligan61133]

Neatly done, John

MichaelG.

.

P.S.

Good to see you using a four-jaw

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

[mark costello 1Participant @markcostello1]

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?

[Steve WithnellParticipant @stevewithnell34426]

Posted by Ketan Swali on 13/05/2015 21:15:48:

He was hiding behind the Lunar lander

**LINK**

Ketan at ARC

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

[Les Jones 1Participant @lesjones1]

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.

[Neil WyattModerator @neilwyatt]

> 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

[john swift 1Participant @johnswift1]

continuing with the early computer theme ,

how about –

Build Your Own NASA Apollo Landing Computer

**LINK**

john

[John Stevenson 1Participant @johnstevenson1]

Posted by mark costello 1 on 23/06/2015 15:29:34:

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?

.

I can't leave the little filly alone, she's too lovely.

Mind you I have been playing with her new lathe, the little Phantom Bantam. I did remark when I brought it into the workshop how small it was, it was too low for me and she's 5' 14" tall so needed to get it jacked up.

Lathe into position for now until a move round after some building work is done, need to add about 820 extra square foot.

And a close up of the feet before the H&S Nazi's can say anything.

Levelling feet all round.

Sooner than put in in this thread I have started a new thread about a belt drive conversion I'm doing on this.

It's called "Lathe Design not Keeping Up. "

[mark costello 1Participant @markcostello1]

What's wrong with the feet that draws unwanted stares from H+S?

[Ian S CParticipant @iansc]

5' 14" ?, that makes 6' 2", maybe 5' 1.4". Just being a picky git. I do like that little lathe.

Ian S C

[John Stevenson 1Participant @johnstevenson1]

Mark,

Until I rounded the corners off it was an invitation to stab you ankles on the corners.

Ian,

6' 2" which is about the hight this one flew over your head

[Flying FiferParticipant @flyingfifer]

John,

6` 2“ , Eyes of blue ?

Reminds me of an old old song. Ian probably hasn`t come in contact with Notts humour !!!

Ducks back into workshop to make more swarf.

[John Stevenson 1Participant @johnstevenson1]

Posted by Flying Fifer on 24/06/2015 16:21:47:

John,

6` 2“ , Eyes of blue ?

Reminds me of an old old song. Ian probably hasn`t come in contact with Notts humour !!!

Ducks back into workshop to make more swarf.

.

"You might think that, I couldn't possibly comment"

[Ian S CParticipant @iansc]

Nuff sed. Ian S C

[davebParticipant @daveb17630]

Posted by Neil Wyatt on 23/06/2015 20:00:07:

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

A lot of pilots have tried this but I never heard of one landing safely. The wreckage that regularly appears at the bottom of glaciers seems to indicate that quantum physics does not operate in the real world.

Dave

[jason udallParticipant @jasonudall57142]

..fly at mountain…qm tunnel..and arrive safely at far side….
Mmmmm

Probability wave function would indeed be non zero at far side but for any mass that large and slow ..the non zero value is …..to use a mathematical term..chuffing small…

[John Stevenson 1Participant @johnstevenson1]

Interesting and relevant job today.

 

BMW motorcycle final drive housing. The last bearing is grooved and pressed into place and a roll pin located it from shuffling by going into the groove.

One problem, it's fitted into a blind hole, can't drill from the other side as that's the "pretty" side.

 

BMW in all fairness recognise it's a problem and fit a longer than standard pin that you can grip with a pair of mole grips fitted to a slide hammer. Problem is rolls pins squash up and are brittle so the bit sticking out just snaps off and you have the rag end of a roll pin just below the surface of a curved casting – lovely.

 

You can get the bearing out by just pulling it and wrecking the roll pin but it's still stuck in and now damaged.

 

Now it actually looks worse than it is as they spend a good hour piggling away at it and getting nowhere and loose heart. So 3mm roll pin – hardened – buried in an expensive alloy casting.

 

But you can weld steel with a Mig with steel wire but you can't weld alloy.

So dob a quick spot on the end of the pin, count three to let it cool, another dob etc. The idea is not to get it stinking hot so the alloy melts, sound easy and it is.

 

Once you have got a nice volcano sticking up weld a bit of studding onto this.

 

 

Fit a stretcher bar across, couple of washers etc.

 

 

Swift pull and jobs a good un.

 

 

Sorry it's a bit out of focus but you get the gist on how bad a state the pin is in after whacking the bearing out.

 

Job done and paint unmarked, another pie and a pint.

Edited By John Stevenson on 30/06/2015 01:34:10

[Bob RodgersonParticipant @bobrodgerson97362]

Nice one John, now if you can tell me how I remove the inner cover from a 1933 Sunbeam model 8 engine. I've roomed the four screws and am presented with a plain flat face looking at me. There are no other fasteners holding it in place and I don't want to resort to doing any welding to provide a means of grip.

[Bob RodgersonParticipant @bobrodgerson97362]

I should have said the inner cover from an oil pump on a 1933 model 8 Sunbeam.

[John Stevenson 1Participant @johnstevenson1]

Bob, Just guessing with no picture but could you tap the securing holes to just the depth of the cover ?

Don't try to extract on these as all you will do is squash the underlying threads but bolt a steel 'cover' over the existing one with a length of studding welded to it and use this plate and studding as a slide hammer ?

[Brian OldfordParticipant @brianoldford70365]

Posted by John Stevenson on 30/06/2015 01:32:28:. . . . . . .

Sorry it's a bit out of focus but you get the gist on how bad a state the pin is in after whacking the bearing out.

Job done and paint unmarked, another pie and a pint.

Edited By John Stevenson on 30/06/2015 01:34:10

Significantly quicker than try to spark it out.

[John Stevenson 1Participant @johnstevenson1]

Started to put this one in the "What did you do today" thread but looked so pretty when it was done it deserves it's own shelf in the Lodge.

Started out with this.

The shaft on the right needs the same splines as the one on the left. It's off something to do with a fork truck transmission and no spares. Ideally it would pay to change the shaft and gear but the 6 spined gear is larger, narrower, and the offset of the dished gear is wrong.

So first thing and this shaft is hardened is to remove some of the shaft and the 6 splines to get under the surface. So in the lathe and using resharpened carbide tips as they won't last long, rip big lumps off. No picture as it's straight forward.

Then build up with weld. The idea is to get the splined end hot so it becomes soft but not allow the pinion to become hot. So weld a bit and let it cool with the pinion under water.

This achieves two things, it keeps the pinion hard and also warms up last nights coffee.

Proof of which is in the photo below, no HAZ on the pinion, and the coffee was lovely.

Throw it back in the lathe and simple turning and we get a blank shaft.

Next bit is hobbing the splines on the old converted Victoria U2 mill. As I only have one bit of the cherry or redo everything again I cut a dummy shaft and checked for fit. I fed the hob in the the text book depth and it came out a nice tap fit onto the gear.

However the hobber has an ER32 inbuilt collet chuck and no way will this pinion fit in so I made a tempory pot chuck with a 20mm spigot to fit the ER32, a ball bearing for a centre and two M5 grub screws as driver dogs to turn the pinion when in the machine.

So cut the spline, only a short one 18mm long and check for fit on the gear, dummy shaft to the right.

All done and dusted, just requires going over the road to the heat treat plant to have the splines induction hardened.

Could do it with a torch and dunk the end but these guys have all the gear and know what they are doing, plus I can get on with something else.

Pie and a pint time……………………………..

[Bob Brown 1Participant @bobbrown1]

What weld wire did you use as filler?

Bob

[John Stevenson 1Participant @johnstevenson1]

Not sure of the ANSI ? number but it's very close to EN8 and allows the weld to be thru hardened.

On a big hardened shaft you can use ordinary MiG wire as there is enough carbon in the original shaft to leech thru and still get a hard surface, smaller shafts not so as many are not thru hardened anyway and you loose most of the case hardening turning undersize.

I have three MiG's set up and ready to run with Y gas connectors and multiple 3 phase sockets on the wall.

One is on 1mm plain MiG wire, one is on 1mm high tensile, the EN8 one, and the last one is on 1mm stainless wire.

Also have two TiG sets, again all plumbed in so never have to change anything unless something runs out.

[Bob RodgersonParticipant @bobrodgerson97362]

Today I have been scratching my head as to how, every time I log into this site and open up a forum I get a pop up telling me I have a virus called "snaketap" and offering to have it removed. Of course when you log in to the "Free" anti virus site you are offered a choice of a whole range of APPS all at a price- no signs of any free ones.

I have also cleaned and prepared the crank cases of a 1933 Sunbeam Model 8 for installation of the crank shaft. I have to fit a new big end bearing to the crankshaft and align the flywheels, hopefully it shouldn't take too much alignment because the crank pin has parallel pin ends and there is only about 3/8" of engagement of pin in the flywheels so a good clout with a four pound lead hammer should persuade it to move without much effort.

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