Author Topic: Rotary valve engine and bonus  (Read 45378 times)

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #75 on: August 27, 2012, 08:03:48 AM »
Thanks Zee, Don and Dave

Zee - the linkages are a little tedious to make, but I'm with you on them being interesting. It's fun seeing how one bit pushes the next and such.

Don - thanks for the kind words. Re. the collet: indeed you and Dave have it sorted.
 :cheers:
Steve

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #76 on: September 01, 2012, 11:57:41 AM »
More work on the linkages. This is take two on this one, the first time I tried to do the turning first and milling second. It failed because the part was no longer strong enough to hold up to the milling.

So this time milling first. The biggest OD which will remain has been turned to size at the far end and a flat has been milled along the rest as a reference for holding in the mill vice.



Then jam a slitting saw in



and drill a 1/16" hole at either end for the pivot pins



Now mill some flats on the other end. Using the side and face cutter to pick up the bottom. Light cuts obviously





Then turned it to obtain this



and then finished it off and dressed it all up with some filing. I made the final linkage, which was much simpler. Here's the whole thing assembled. I'm using a drill for the pivot pin at the top



Even managed to get it all ticking over smoothly.

 :cheers:
Steve

Offline ironman123

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Re: Rotary valve engine and bonus
« Reply #77 on: September 01, 2012, 02:43:11 PM »
Looking real good.  It can be a mean runner.  Hold it down.

Ray
Ray
Central Texas

Offline Don1966

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Re: Rotary valve engine and bonus
« Reply #78 on: September 01, 2012, 03:56:56 PM »
Steve it looks like you are almost there. Keep up the great work.

Don

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #79 on: September 02, 2012, 01:02:15 AM »
Thanks Don and Ray

Sounds like I should consider bolting it onto a nice heavy base

Steve

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #80 on: September 05, 2012, 11:32:33 AM »
Did a little more; not much as I was struggling a little having been a bit busy at work

I turned up a couple of exhaust flanges which bolt onto the head. Here is a shot of putting on the final chamfers before parting off. A bit of HSS ground up as a form tool for 45deg chamfers is a mighty useful bit of kit.



I also made a couple of collars which go onto the rotating valve rod. I still have to drill some holes in these bits and clean up the parted off side on the collars.



I'm thinking of making some 10BA nuts and studs to hold some of the remaining bits on. Might consider making a start on that tomorrow evening if I can get my act together.

 :cheers:
Steve

Offline arnoldb

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Re: Rotary valve engine and bonus
« Reply #81 on: September 05, 2012, 05:57:06 PM »
Looking good Steve  :ThumbsUp:
The linkages and little bolts and nuts are always the slow fiddly bits to make  ;)
At least you're getting a bit of shop; my schedule have been hectic of late...

Kind regards, Arnold
Building an engine takes Patience, Planning, Preparation and Machining.
Procrastination is nearly the same, but it precludes machining.
Thus, an engine will only be built once the procrastination stops and the machining begins!

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #82 on: September 06, 2012, 12:18:18 AM »
Thanks Arnold

Hope you can find some more time for yourself soon.

Steve

Offline steamer

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Re: Rotary valve engine and bonus
« Reply #83 on: September 06, 2012, 01:02:49 AM »
Looking like a runner soon Steve...keep at it!
Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #84 on: September 06, 2012, 01:08:53 AM »
Hope so Dave. I'm gonna have to track down some compressed air!

Steve

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #85 on: September 09, 2012, 02:11:45 PM »
I decided I needed some 10BA nuts for this and that I'd make them rather than going to the trouble of buying them from some specialist shop.

First shot is a bit of 7/16" hex drilled with some 5/32 round brass held in it by a grub screw. I have alot of these hex offcuts,



then milled the hex, 3mm across flats, using the side of the endmill



Next drilled, initial tapped, chamfered and parted off in the lathe. Finish tapped by hand. They're a little dirty. I didn't notice that until seeing the photo because they're so small



Also made some threaded rod, both 8 and 10BA. I borrowed Jo's trick of cutting a bit and then moving it further out of the chuck



Here's an 8BA grub screw that will be used to hold the collars on the rotary valve rod. The screw is sitting in the corner of my piercing saw which I used to put the slot in it



I also drilled a couple of holes for the inlet into the cylinders. Had to put some brass rod in to help guide the drill. That's it clamped with the G-clamp. I'd previously placed the centre drilled holes in the correct position on the milling machine



Here's a shot of the two holes. You can see how they're slightly offset, by 1/32" either side of the centre line



Hopefully that wasn't too incoherent. I'll try to pull it back from the madness a little next time

Steve

Offline zeeprogrammer

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Re: Rotary valve engine and bonus
« Reply #86 on: September 09, 2012, 03:08:57 PM »
Nice trick using the hex as a holder.
No way I could have done such a nice job hand sawing the slot.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Don1966

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Re: Rotary valve engine and bonus
« Reply #87 on: September 09, 2012, 03:46:14 PM »
Hi Steve, still following with interest and you are getting closer to a runner. Great job so far.

Don

Offline swilliams

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Re: Rotary valve engine and bonus
« Reply #88 on: September 12, 2012, 01:45:33 PM »
Thanks Don and Carl

I thought I replied to you guys, but I must have forgot to push the post button  :Doh:

Anyway, I managed to drill some holes and make some 10BA studs. Got another 8 small 10BA studs to go. I got one of the exhaust tubes attached, complete with my home made 10BA nuts



Steve

Offline Bearcar1

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Re: Rotary valve engine and bonus
« Reply #89 on: September 12, 2012, 02:41:56 PM »
Looking good Steve ....  :ThumbsUp:


BC1
Jim

 

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