Author Topic: The Artful Bodger's nutating engine! (Read 48495 times)

Bernd · « **Reply #25 on:** July 17, 2009, 09:49:04 AM »

Doesn't need a mirror finish to look good.

Nice to see somebody using a shaper instead of a mill (which you don't have) to make a part.

Wish I had a small shaper like that. It would round out my machine stable nicely.

Keep up the good work John.

Bernd

dsquire · « **Reply #26 on:** July 17, 2009, 01:27:52 PM »

John

Nice Job and great to see another way to "skin the cat". Looking forward to seeing more of Sally the Shaper at work.

cheers

Don

Darren · « **Reply #27 on:** July 17, 2009, 03:18:29 PM »

Did I ever mention I like shapers......

I'll get me coat......

Nice work there John, looks like it's coming along.....

John Hill · « **Reply #28 on:** July 17, 2009, 04:47:55 PM »

Darren, you are quite right to treat your shaper with respect, Sally showed her true colours by developing a fault in here off/on switch. I turned her off and was just putting the key on the tool clamp when she started again!

That will have to be fixed or I will loose a finger or two!

Darren · « **Reply #29 on:** July 17, 2009, 05:14:16 PM »

ooh, that could be nasty John, better get her seen to pronto....

bogstandard · « **Reply #30 on:** July 18, 2009, 05:09:29 PM »

John,

This is a bit

, and it refers to your earlier posts about holding work on your vertical slide.

I have just put an answer on another website, and immediately thought of your problem.

If you go down the page on here,

http://www.arceurotrade.co.uk/Catalogue/Machines-Accessories/Lathe-Accessories

You will come to C3 Milling Sub-Table. I think that might be your solution in the short term. Either mount a bar on the back and hold it in the 'vice', or drill straight into the 'vice' jaws and bolt it on.

Get the plate mounted up first, then use the lathe to square up the plate and drill all the holes. Then it would just be a matter of knocking up a few clamps and fences.

Just a thought.

John

John Hill · « **Reply #31 on:** July 19, 2009, 03:54:31 AM »

Excellent Bogs!

I could certainly manage to make something like that! Meanwhile I have coaxed Sally Shaper to take the lugs off the sides of a little machine vice with now fits entirely inside the jaws of the slide. At least I can now mill small parts without too much hassle.

John Hill · « **Reply #32 on:** July 22, 2009, 04:10:27 AM »

The Artful Bodger makes a flywheel.

...Were words necessary?

Stilldrillin · « **Reply #33 on:** July 22, 2009, 04:13:21 AM »

NO!!!

Blummin well shown!

David D

Bernd · « **Reply #34 on:** July 22, 2009, 10:33:38 AM »

NO words were not needed. If they were it would have been a 10,000 word post.

I like the way you riveted the flywheel to that shaft.

Bernd

sbwhart · « **Reply #35 on:** July 22, 2009, 11:31:44 AM »

Cracking job John

Well done

Stew

Brass_Machine · « **Reply #36 on:** July 22, 2009, 12:05:01 PM »

Pretty cool John. Pictures described well enough I believe.

Eric

CrewCab · « **Reply #37 on:** July 22, 2009, 12:11:58 PM »

Quote from: Bernd on July 22, 2009, 10:33:38 AM

I like the way you riveted the flywheel to that shaft.

Now I've regained the plot

............... Nicely bodged Mr Hill

CC

John Hill · « **Reply #38 on:** July 22, 2009, 03:06:22 PM »

Thank you for kind words!

John Hill · « **Reply #39 on:** July 25, 2009, 03:41:48 AM »

Progress is rather slow but a bit got done today!

These are the crank webs being drilled, a piece of angle iron from the junk pile was cleaned up on the shaper and made a nice angle bracket that I do not mind drilling holes in!

All the moving bits seem to fit together! There will be quite a bit of Loctite or super glue to hold it all together, silver solder would be ideal but I dont have the torch right now and besides I dont want to cook the bearing.

Next, finish the frame, mount the bits then make the inlet and exhaust ports!

sbwhart · « **Reply #40 on:** July 25, 2009, 04:24:11 AM »

Coming together nicely John:-

I've still no idea how it work

but all will be revealed in time no doubt.

Have fun

Stew

Stefan Pynappels · « **Reply #41 on:** July 29, 2009, 02:35:14 PM »

I think it is becoming a little clearer how this works, but I'm not going to say anything until I see it running so I don't look stupid!
Pretty ingenious though if my thoughts are correct.

Stef.

John Hill · « **Reply #42 on:** July 29, 2009, 05:10:28 PM »

Stef, Stew, you are not the only ones eagerly anticipating when it might work as I am not even really sure myself!

Other priorities right now but work continues, slowly, on the frame.

John Hill · « **Reply #43 on:** August 03, 2009, 04:11:09 AM »

The crankshaft was assembled today for what may be the final time! I used the lathe chucks to ensure parts were in close alignment before pressing them together.

No solder of screwed mounts, just a close fit, super glue and fingers crossed.

bogstandard · « **Reply #44 on:** August 03, 2009, 04:33:18 AM »

John,

Personally, I don't think superglue will hold it, especially as the pins are a tight fit. Because it would have been squeezed out of the joint anyway and just sat on the surface, doing nothing to hold the joint together. You will be relying on the fit of the pins in the holes to do the intended job.
Superglue has no strength at all in the operation you are trying to carry out. It is OK for sticking broken cups together, but not as an engineering adhesive. Unless of course you have managed to obtain some of the very hi tech two part stuff, that can take the place of welds.

Even Loctite has to have a working gap to work.

If I need to use adhesive and a tight fit at the same time. I always oversize the hole a minute amount and put a straight knurl on the ends of the rod to expand the rod to make it a tight fit in the hole. Even a light knurl will expand a rod a few thou, the deeper the knurl, the larger the rod 'grows'.
Then with Loctite on the knurl, some is automatically taken down into the hole in the tiny knurl gaps, ready to do it's job.

Bringer of bad news Bogs.

John Hill · « **Reply #45 on:** August 03, 2009, 04:52:07 AM »

Not bad news at all John, what I dread is having it all assembled then being unable to get it apart again! Super glue was chosen after our discussion here about boiling water etc etc.

The joints are not really all that tight in fact a couple I had to tighten up a little by putting dot punch marks on the shaft, I know that about knurling and used it only yesterday on another little job but I thought it might have been impossible on such small shafts, my knurler is one of those 'push against' rather than 'pinch me' style fandangles.

There will be much rejoicing if it actually runs long enough to shake itself to bits at which time I will be looking for the more appropriate fixative!

Oh, I must take you to task for your comment regarding broken cups, it is not OK for sticking broken cups together as in that application it much prefers to stick crockery to fingers etc!

Thanks for your comments John.

bogstandard · « **Reply #46 on:** August 03, 2009, 06:18:31 AM »

Sorry about that, but it is better to be informed than ignorant (I am no way implying you are).

Actually the only time I use my scissor knurl is when doing small shafts, it hasn't got the grunt to be able to knurl bigger stuff.

Quote

it is not OK for sticking broken cups together as in that application it much prefers to stick crockery to fingers etc!

Instant, but fragile castanets

John

John Hill · « **Reply #47 on:** August 03, 2009, 04:05:58 PM »

Bogs, in the field of model engineering, in fact metal working in general, you have my permission to consider me as woefully ignorant!

I sort of have it all together right now though the frame is clamped together with a big bolt and the cylinder is held in place with magnets. The nutation effect is actually better than I expected but there is a lot of friction which I hope is due to no ports having been cut yet.

No play today, work all day then going out this evening.

rleete · « **Reply #48 on:** August 03, 2009, 04:17:31 PM »

What about pinning it together? Use spring pins for the testing, and it you leave them a bit long you can pull them out.

After testing/fitting/tweaking, you can replace them with press fit brass pins.

John Hill · « **Reply #49 on:** August 03, 2009, 05:23:27 PM »

Good point Rleete, I will bear that in mind when I come to fixing the flywheel(s).

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Author Topic: The Artful Bodger's nutating engine! (Read 48495 times)

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