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The Post Man Cometh.

James Coombes Engine

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Nick_G28/10/2014 17:25:52
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498 photos

.

With a box of bits :-

So in the famous words of Captain Lawrence Oats. " I may be gone some time."

Nick laugh

Boiler Bri28/10/2014 18:22:17
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591 forum posts
295 photos

Nice have fun. My c106 copper also came today, so I can now get with my boiler.

Not looking forwards to my credit card bill though😪

Bri

GaryM28/10/2014 21:58:56
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314 forum posts
44 photos

Good luck with the build Nick. One thing I found with the S50 kit was that some of the stock supplied is only just slightly larger than the part to be made, a bit mean considering the cost of the kits. I found it useful to have some spare stock in the appropriate sizes to give a bit more room for manoeuvre and also if I made a mistake I could have another go immediately without waiting a few days for metal to arrive.

Gary

Nick_G28/10/2014 23:06:17
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1279 forum posts
498 photos
Posted by GaryM on 28/10/2014 21:58:56:

some of the stock supplied is only just slightly larger than the part to be made,

Gary

I have just noticed this.!

On the James Coombes there are 2 plates. The supplied stock is slightly smaller than the specified size on the drawing before I even start to square them up.

These are not critical parts so long as they are both the same. But that is not the point now is it.??? - The parts and their placement that go onto these plates however are critical.

Anyway. I have squared them up and this gave me a good excuse to have a play with the new mill and its associated sundries I have purchased. smiley

Bad news is I have come to the conclusion I need to buy a height guage. sad

Nick

Ed Duffner29/10/2014 01:27:19
592 forum posts
43 photos

Is it finished yet? smiley

Would a scribing block give you the accuracy Nick?

Nick_G29/10/2014 19:34:05
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498 photos
Posted by Ed Duffner on 29/10/2014 01:27:19:

Is it finished yet? smiley

Yeahhh, course.! ................ I am just waiting for the paint to dry and the compressor tank to charge. cheeky

Nick wink

Nick_G30/10/2014 22:44:54
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1279 forum posts
498 photos

.

Painted over a few castings yesterday with a preliminary coat of red oxide and this evening I sized up the pedistal / base.

Nick

Nick_G31/10/2014 19:08:46
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1279 forum posts
498 photos

.

It's getting taller.!

I will trim the studs that go through the top plate to make them all the same length.

Also on examination there is a casting that provides a pedistal for one of the main bearings. This is a bit banana shaped. So I rang Stuart's today and they are putting a replacement in the post.

Nick

Boiler Bri31/10/2014 19:20:29
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591 forum posts
295 photos

 

Wow, you don't waste time, looking good keep the pics coming.

It looks like your getting to grips with the new milling machine. 

Bri

Edited By Boiler Bri on 31/10/2014 19:23:38

JasonB31/10/2014 19:54:18
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That's comming on well, don't polish those columns up too much, the paint won't sticksmile p

Nick_G31/10/2014 20:46:58
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1279 forum posts
498 photos

.

When it comes to boring the cylinder, which is a 1" diameter. I have a 1" machine reamer.

Is it OK to make the final pass on the bore with this reamer or is there a reason why this is not a good idea.?

Nick

JasonB01/11/2014 10:07:16
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Assuming it came with iron rings I would bore and hone it but you could also bore, ream and hone which would eliminate any possible taper caused by a bit of spring in the boring bar.

Before you start machining the cylinder poke a bit of wire through t eports to make sure they are clear and remove any remaining sand from the cores.

J

Nick_G01/11/2014 13:52:55
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1279 forum posts
498 photos
Posted by Nick_G on 31/10/2014 19:08:46:

.

Also on examination there is a casting that provides a pedistal for one of the main bearings. This is a bit banana shaped. So I rang Stuart's today and they are putting a replacement in the post.

Nick

.

It gives me pleasure to report that less than 24 hours later from the phone call a replacement casting has arrived from Stuart. (a straight one. wink)

Nick

Boiler Bri01/11/2014 16:15:36
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591 forum posts
295 photos

Interesting point on the honing, I had a small stainless steel 30ml volumetric pump sent back this week from a well know whiskey maker/bottler. When I manufactured it I had the bore mirror finish for the piston, PTFE to run against. Over time the PTFE was rubbing off in the form of a black paste. It had started to show in the bottled whiskey.

The cure was to finish the bore to: 16-32 micro inches which looks like it had been sanded not honed. The PTFE will over the first 30 minutes of the pump running shed and fill the pores of the metal with PTFE , this will then rub against the piston, also PTFE and solve the problem.

After a lot of years in the bottling trade I have learnt something new!

Bri

Neil Wyatt01/11/2014 17:33:58
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If they need a volunteer to dispose of the contaminated whisky, I'm sure I can help.

Neil

<starts searching out filter papers>

Nick_G05/11/2014 21:45:35
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1279 forum posts
498 photos

.

Hi folks, back on parade with a little bit more construction. I did intend to spend the entire of last Sunday in the workshop but due to my own stupidity wink Sunday was a total write off due to the mother of all hangovers and I spent it lay on the sofa feeling sorry for myself while cursing myself. crying

Anyway, the cylinder has been attacked.

The port face had been milled prior to the boring and facing operations.

 

The flywheel has also had some disciplinary corrective treatment issued. The first side was faced and turned. Also at this setting the bore was drilled and reamed. (not shown)

 

 

Video can be seen here :- **LINK**

 

The flywheel was then flipped over and centered so the other side could be faced.

 

Nick

Edited By Nick_G on 05/11/2014 21:47:39

Boiler Bri05/11/2014 22:03:12
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591 forum posts
295 photos

Hi Nick. All looking good. Just a bit worried about those clamps. I thought you had to have a packing under the lower edge to make them clamp properly?

Bri

Boiler Bri05/11/2014 22:07:14
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591 forum posts
295 photos

Just watched the vid. What's the coloured packings ?

Bri

Nick_G05/11/2014 22:08:25
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1279 forum posts
498 photos
Posted by Boiler Bri on 05/11/2014 22:03:12:

Hi Nick. All looking good. Just a bit worried about those clamps. I thought you had to have a packing under the lower edge to make them clamp properly?

Bri

Do I.? .............. Ooops. blush

It does seem however that I 'got away with it' ............ This time.!

Thanks for the info. I shall know better next time.

Nick

JasonB06/11/2014 07:27:30
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9788 forum posts
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Looks like the clamps actually wedged themselves between two spokes rather than just the cranked end holding things down. Also make sure the bolt is near the work end not the support end like you have them.

Oh and hold your phone the other way round when doing a video, thought a photographer whould know thatsmile p

Comming on wel though

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