Author Topic: Bodging with Boris/ Bernhardt........ (Read 65272 times)

fcheslop · « **Reply #25 on:** October 18, 2016, 05:44:03 PM »

]I can never understand it either . Is it the builder knows better and uses whats available not knowing that the ratio has to be near ish
Although some well known designers have goofed in the past just look at ET Westburys version of the Robinson the ratio is badly wrong and he had not appreciated the rather unusual displacer and the cold well the full size one had and yet published drawings :doh:Thats why the one I started now resides under the bench with the spiders unless it finds a new home
Ah well we live and learn although the older I become the less I know
Just had a good glass breaking day

Good luck with her .Just love that conrod set up

cheers

Stilldrillin · « **Reply #26 on:** October 18, 2016, 06:01:09 PM »

That made interesting reading! (If you're into these frustrating things)........

Seems, even the engine heirarchy don't realise the laws of physics!

Are you teasing test tubes, again?

fcheslop · « **Reply #27 on:** October 18, 2016, 06:17:34 PM »

Oh I breaking test tubes again on the the Ridders Wiggers. Had everything nicely cut then picked up a bit of paper forgetting Id safely wrapped the hot cap in it

they dont bounce
Back to the drawing board
That exhaust pipe you snaffled whats the OD as Im looking for some 1 7/8 for the orphan or may use a barby grill block.
Hit lucky for once and found some heavy walled stainless seamless tubing for the Ryder so should get back on with it shortly and yep still blaming you

cheers

Stilldrillin · « **Reply #28 on:** October 19, 2016, 04:03:19 AM »

Stainless exhaust tube, 1 7/8" / 48mm.

Here yer go...... http://www.ebay.co.uk/itm/48mm-1-1-875-Stainless-Tube-Pipe-Hose-x-250mm-0-25m-10-Length-Exhaust-T304-/271533750860?hash=item3f38ac3a4c:g:bx0AAOSwGiRTrXjM

fcheslop · « **Reply #29 on:** October 19, 2016, 02:50:34 PM »

Thanks

We have a runner.Just needs stripping/cleaning and getting rid of the oil in the glass dispacer

May be simpler to make another with a blind hole.
The tube is for the Ryders displacer.
Good luck with the rebuild Il stop clogging up youre thread

Stilldrillin · « **Reply #30 on:** November 06, 2016, 09:39:25 AM »

Managed to get some Boris work done, over the past week.

I'm used to catching up on household, gonna do's. But, after all this, "almost crocked" time, I'm having trouble with, whatabout's, whenyergonna's, and havyerforgotten's.......

A piece of 1/4" brass, spigoted/ screwed to the end of 8mm dia bar.......

6mm, far end. 4mm, this end. 110mm apart.......

Taper turn. Mill little end flats........

That looks better, to me........

Graphite piston. Roughed out, and parted off. (Most of the mucky work done)......

Thanks for looking in!

David.

Stilldrillin · « **Reply #31 on:** November 06, 2016, 09:49:43 AM »

I've got a bit behind, with the write up......

Delrin mandrel, to mount piston.......

Held on, with M6 caphead. Finish turned, until it almost enters the bore. Mucky stuff!

Six inch rule. Supporting reversed emery cloth.

Polish the outer end o/d, until the piston enters the cylinder. Then, polish the centre section. allowing it to enter some more.

Then finally, polish the skirt area. Allowing full length entry to cylinder.......

Obviously, both hands needed for polishing control. I needed my left hand for the camera!

Reversed emery cloth is used for polishing graphite.
Fine emery cloth. Correct way around, for brass etc.

The steel rule backing, gives much better control, than fingers....

Thanks for looking in!

David.

Stilldrillin · « **Reply #32 on:** November 06, 2016, 09:55:03 AM »

I slotted and cross drilled/ reamed. The clevis.......

Drill/ tapped M4 through. Reducing shank to 6mm dia, to locate in piston......

That looks better, than original........

This afternoon, I finished the piston/ cylinder fit to each other. Then sleevelocked the cylinder liner in place, in the original cylinder.

Assembly, tomorrow. Wonder if we'll have a runner, soon?

Thanks for looking in!

David.

Stilldrillin · « **Reply #33 on:** November 06, 2016, 12:25:50 PM »

We've now caught up to, last Friday.

Finished piston/ rod assembly........

Commence assembly.........

Not happy with the offset scotch yoke, link. It wants to bend the unsupported displacer shaft.......

Now, we just need a flywheel.......

I have a suitable casting. Though, it is made of unknown bronze. Rather tough stuff!

That is a 4" dia chuck. I like to make my machinery work hard, when necessary.........

The belt had done 3 years, since I modded the lathe to lower the gearing. Can't grumble!

All good Engineers have a spare! It was up and running, after 20 mins fumbling. But, I'd had enough, for one day........

Thanks for looking in!

David.

Stilldrillin · « **Reply #34 on:** November 06, 2016, 05:28:51 PM »

Finally got the flywheel, proof turned. Sufficient to be in balance.......

Put a small light under. And, after a few seconds.........

It's a great feeling!

David.

sbwhart · « **Reply #35 on:** November 07, 2016, 02:44:34 AM »

Blimy Dave your knocking these engines out like drinking tea

Great Job

Stew

Stilldrillin · « **Reply #36 on:** November 07, 2016, 03:25:31 AM »

Quote from: sbwhart on November 07, 2016, 02:44:34 AM

Blimy Dave your knocking these engines out like drinking tea

Great Job

Stew

Thanks Stew!

I reckon, I've got the hang of them, now.....

millwright · « **Reply #37 on:** November 07, 2016, 01:29:56 PM »

Another success story from the 'Waifs and Strays Orphanage' somewhere in deepest Derbyshire. well done David long may you keep churning them out.

John

fcheslop · « **Reply #38 on:** November 07, 2016, 01:40:35 PM »

Congratulations

Whats next

Stilldrillin · « **Reply #39 on:** November 07, 2016, 02:15:02 PM »

Quote from: millwright on November 07, 2016, 01:29:56 PM

Another success story from the 'Waifs and Strays Orphanage' somewhere in deepest Derbyshire. well done David long may you keep churning them out.

John

Thanks John!

Stilldrillin · « **Reply #40 on:** November 07, 2016, 02:27:48 PM »

Quote from: fcheslop on November 07, 2016, 01:40:35 PM

Congratulations
Whats next

Thanks Frazer Lad!

Next? Why? Is this one finished?

Not by a long way.......

Redesign scotch yoke. Add another crank disc, and bearing. Sort out water jacket.

Just started on new burner. Got a show, this Saturday.......

Sheesh!

fcheslop · « **Reply #41 on:** November 07, 2016, 05:16:27 PM »

Ah well it will keep you from getting under youre lasses feet
Gave up for today just to cold for a wimp like me
cheers marra

Stilldrillin · « **Reply #42 on:** November 07, 2016, 05:40:04 PM »

It was certainly cold, out there!

So, I did some silver soldering......

fcheslop · « **Reply #43 on:** November 08, 2016, 02:08:50 PM »

So you found the brass monkey then
cheers

Stilldrillin · « **Reply #44 on:** November 08, 2016, 03:16:39 PM »

Quote from: fcheslop on November 08, 2016, 02:08:50 PM

So you found the brass monkey then
cheers

Yes! He's all attached again. For now........

John Rudd · « **Reply #45 on:** November 08, 2016, 03:29:13 PM »

Nice job, good to see something come of all your hard work...

Stilldrillin · « **Reply #46 on:** November 16, 2016, 05:22:23 PM »

Thanks John.
Lots more work to do. Ran it at Saturday's show, and after 1/4hr the whole crank assembly was wagging about, loose!

The bearing column, isn't fixed on to anything substantial.......

It's more of a "looking at", engine.......

jcs0001 · « **Reply #47 on:** November 16, 2016, 09:23:01 PM »

Nice little engine - I enjoyed the photos and video. Thanks for taking the time and trouble to post them.

John.

Stilldrillin · « **Reply #48 on:** January 04, 2017, 08:33:05 AM »

Thanks John!
I'm afraid, I don't agree with the "little", comment. To me, it's just, big. Very poorly designed, and built......

(Just the sort of project I like).......

After a few weeks silence. I can only report, more negative progress, on this frustrating project.......

After some 10mins running, at Earl Shilton. The crank assembly began rocking from side to side, on it's single, 6mm wide upright!

Reminded me of stepping into a rowing boat/ dinghy........

Secured with M3 countersunk screws.......

Up close. "You could stick yer cap neb, under there!".......

It's almost stood on tiptoe! The column base isn't flat!

You can see the rub mark, of the "keel". Inboard of the outer two screw holes.......

I'm now planning a new crankshaft assembly. With bearings at each end. As it should be.......

Thanks for looking in!
David.

Stilldrillin · « **Reply #49 on:** September 23, 2017, 05:40:04 PM »

Yikes! It has been almost 9 months, since I last wrote anything about this, shambles!

As we can now, all, see the previous Pbucket pics, using the appropriate add ons.......

Firefox..... https://addons.mozilla.org/en-US/firefox/addon/photobucket-fixer/

Chrome..... https://chrome.google.com/webstore/search/photobucket_hotlink_fix?hl=en

I'll continue with, Blundering with Boris. Hope, there's still some interest!

I wondered, why the new displacer insisted on catching the inside of the hot cap.

The shaft guide was at an angle, having been hammered into the bulkhead......

Time to strip, completely. And, totally rebuild......

I've taken the pics, as I've gone along. Not always, in sequence.....

First job, was to get rid of the unnecessary/ leaking, water jacket.

Four inch dia. Made from tough stainless steel. Not easy to machine, with a mini lathe's power.....

What a mess, in there!

I intended incorporating the end flange, into the cooling fins.......

But. The darned thing fell off. After I'd drilled the new screw holes.....

Yet another "interesting situation", needing a solution........

More to follow. Thanks for looking in.

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Author Topic: Bodging with Boris/ Bernhardt........ (Read 65272 times)