Author Topic: Another Westbury Wyvern build  (Read 824 times)

Offline deltatango

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Another Westbury Wyvern build
« on: January 01, 2019, 11:38:15 AM »
Hi everyone and I hope you all have a very happy and useful 2019!

Now that Mastiff is running (not really finished, but nothing here ever is) its time to make a start on the next project. It is also the 1st January 2019 which sounds like a good time to start anything.

Making Mastiff generated a lot of swarf and all that metal carving has, at least temporarily, satisfied my need for machining from the solid. This time around I have a set of castings and materials for E. T. Westbury's "Wyvern". Once again I've modelled the engine based on the original Westbury drawings (plus hints from this forum and others) using the Alibre 3D CAD package. With Mastiff I made 2D drawings as and when needed, this time I've created a full set before starting to cut metal. No doubt I'll find out the problems with these as I go along.

Many of you will already know what Wyvern looks like but here it is for those who don't:



The PDF of the GA drawing is at :

https://onedrive.live.com/?authkey=%21AJ%5FpFM1IAFxp8q4&cid=2272D9130B9B6673&id=2272D9130B9B6673%212741&parId=2272D9130B9B6673%212733&o=OneUp

It is too big to attach and I'm not sure just how to add a hyperlink to a file, hope it works. If not I guess someone will put me straight.

The casting set from Hemingway Kits looks like:



Only the flywheels are in CI.

I made a start on machining the sub-base this pm, pictures in the next post.

Regards, David
« Last Edit: January 01, 2019, 06:09:49 PM by Jo »

Offline Jo

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Re: Another Westbury Wyvern build
« Reply #1 on: January 01, 2019, 12:00:32 PM »
:thinking: Nice set of castings David. We just checked our set and they the flywheels are the only CI parts in that set as well. Our carb is Ali... Have you thought about the skew gears


Looking forward to watching your build.

Jo

P.S. I fixed both links  ;)

« Last Edit: January 01, 2019, 06:12:50 PM by Jo »
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Offline Alyn Foundry

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Re: Another Westbury Wyvern build
« Reply #2 on: January 01, 2019, 01:51:16 PM »
Like these?

 ;)

Offline Jasonb

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Re: Another Westbury Wyvern build
« Reply #3 on: January 01, 2019, 03:04:01 PM »
Ideal if you are going for the "barn find" look :LittleDevil:

Nice job on the drawings though the link does not work for me either. Lookforward to following your build.

Offline Alyn Foundry

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Re: Another Westbury Wyvern build
« Reply #4 on: January 01, 2019, 03:59:29 PM »
Ideal if you are going for the "barn find" look :LittleDevil:


Hi Jason.

The " special " coating isn't just for castings, you know!!   :lolb:

Ten sets were cut for my Hornsby Akroyd quarter scale replica. Half inch crankshaft 5/16" sideshaft.

Offline b.lindsey

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Re: Another Westbury Wyvern build
« Reply #5 on: January 01, 2019, 04:18:13 PM »
David, I think the link is fixed now.

Bill

Offline Jasonb

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Re: Another Westbury Wyvern build
« Reply #6 on: January 01, 2019, 04:20:35 PM »
link works now though it only goes to an image and not a pdf but we have lost the image of the drawing from the post :headscratch:

Offline b.lindsey

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Re: Another Westbury Wyvern build
« Reply #7 on: January 01, 2019, 05:45:58 PM »
I didn't mess with the other link that I know of. Maybe David can edit that one since it worked the first time.

Bill

Offline Jasonb

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Re: Another Westbury Wyvern build
« Reply #8 on: January 01, 2019, 06:31:46 PM »
Both correct now.

Offline Art K

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Re: Another Westbury Wyvern build
« Reply #9 on: January 01, 2019, 11:05:18 PM »
David,
That looks like an interesting project. Must admit to not having built from castings despite having a set of Galloway 1/6 scale.
Art
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Offline deltatango

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Re: Another Westbury Wyvern build
« Reply #10 on: January 01, 2019, 11:49:50 PM »
Hi Jo, Jason and Bill,
Thanks for sorting out the link, I think I now know the format, will find out for sure shortly.

The skew gears I have came without the protective brown coating:



Unlike soggier parts of the globe I can store things and have them stay dry. The downside is the occasional "warmer" day - Friday's forecast is for 42 C.

The first bit of machining was on the sub-base. After filing and using wet-or-dry on the surface plate to flatten off the bottom the casting was brought to height on the mill:



The alloy was horrible to file, even a sharp file filled with chalk picked up and scored the surface, but the AGPT tips on the facing cutter left a really good finish.

The drawing shows the height as 2.75", the casting cleaned up to this with ~0.030 to spare; a warning to check and set up all castings carefully and remove the minimum of metal:



The PDF of the drawing is, I hope, at:

https://1drv.ms/b/s!AnNmmwsT2XIilTCcfiNHmMoajmAv

A 3D PDF (generated by Alibre so it will be free from any nasties) of the whole engine model is at:

https://1drv.ms/b/s!AnNmmwsT2XIilTQ0E39PkE9RAM1T

If anyone wants info on using the 3D PDF format, please let me know and I'll try to help. There is a lot you can do with these (e.g. cut sections).

David

OK, had to edit the URL for the drawing - I'd put in the .jpg in error. DT
« Last Edit: January 01, 2019, 11:56:23 PM by deltatango »

Offline simplyloco

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Re: Another Westbury Wyvern build
« Reply #11 on: January 02, 2019, 12:28:04 AM »

Unlike soggier parts of the globe I can store things and have them stay dry. The downside is the occasional "warmer" day - Friday's forecast is for 42 C.
SNIP
David

I know how you feel. I lived in Doha, Qatar for over a year in the late 80's: 48C during the summer... :hellno:
John

Offline Jasonb

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Re: Another Westbury Wyvern build
« Reply #12 on: January 02, 2019, 07:24:26 AM »
3D file is working OK.

Offline deltatango

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Re: Another Westbury Wyvern build
« Reply #13 on: January 02, 2019, 07:50:43 AM »
Thanks for confirming that Jason.
David

Offline Dave Otto

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Re: Another Westbury Wyvern build
« Reply #14 on: January 02, 2019, 11:50:10 PM »
Nice work on the CAD model David.
I will be looking forward to following along with your build.

Dave

Offline Roger B

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Re: Another Westbury Wyvern build
« Reply #15 on: January 03, 2019, 11:02:55 AM »
Another interesting build to follow  :ThumbsUp:  :ThumbsUp:  :wine1:
Best regards

Roger

Offline deltatango

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Re: Another Westbury Wyvern build
« Reply #16 on: January 03, 2019, 08:51:32 PM »
Thanks Dave and Roger, it's good to have you along.

Summer may slow down progress for a while (e.g. fishing, beach and the garden) so please be patient!

David

Offline deltatango

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Re: Another Westbury Wyvern build
« Reply #17 on: January 18, 2019, 01:19:46 AM »
Right - back from the beach and into the workshop.

Getting the bed plate squared up and to size looks like it's critical and everyone here tell me that these casting thingies aren't always quite what they should be. A careful check was needed:



Everything looked close to right and had enough (just) metal to get the part out of it, I missed seeing the only bit that was misplaced until later. The datum faces are going to be the underside and two edges of the bottom flange:



which involved a lot of careful clamp-juggling to keep the casting secure and get access for the cutter:



after turning the part over I could machine much more stable clamping surfaces on the top:



which allowed me to drill the securing stud holes - including one in the wrong place and the JBW'd plug is just visible here:



with the casting nested against a parallel clamped to the angle plate (it all has to be this way 'round to get the Y-axis travel needed, must look at a more flexible clamping system sometime) the cylinder mounting face was machined - note the bit of JBW where some of the earlier clamp-juggling failed:



Turned over yet again, but this time with stable and secure clamping surfaces available, I could clean up the inside edges. In an ideal world this would just be a quick filing job but the first error in the original drawings comes into play here. The width of this slot in the bed plate is shown as 1.5", exactly the width of the crank webs that have to turn in the slot (the original GA has the slot drawn with some useful clearance), so I opened this up to 1.625" with a boring head and then the cutter here:



Yet another inversion allows the sides of the main bearing flanges to be brought to size and here I found the only "error" in the casting - one side was displaced ~1/16" towards the centre line and the far side didn't clean up completely. This doesn't look like causing any real problems with the bearing's lateral location, if it does then it's back to the JBW and a bit more machining. Dental mirrors can be very useful things as well:



The last operation (for this post) was to face off the main bearing split line ready to fit the bearing caps. I thought the setting the 30 degree angle by the scale on the Aciera table was sufficiently precise:



If I'd thought this through properly I'd have clamped up the part before tilting the table, otherwise you need four hands to fiddle everything into place. This stays set up until the holes are drilled for the bearing caps.

David



Offline b.lindsey

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Re: Another Westbury Wyvern build
« Reply #18 on: January 18, 2019, 02:27:48 AM »
Hope the beach was enjoyable David. Nice to have you back too though and in the shop again.

Bill

Offline deltatango

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Re: Another Westbury Wyvern build
« Reply #19 on: January 18, 2019, 03:08:59 AM »
Thanks Bill, it was. My late father-in-law bought the land around 1955 and he and a couple of mates built the house over the next few years. There's a dirt road across the front then the creek and beach (below at sunset):



David

Online steamer

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Re: Another Westbury Wyvern build
« Reply #20 on: January 18, 2019, 03:55:53 AM »
Nice Set ups!    Gotta love the Aciera!

Dave
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Damned ijjit!