The Post Man Cometh.

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The Post Man Cometh.

This topic has 123 replies, 24 voices, and was last updated 3 July 2016 at 00:31 by Nick_G.

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28 October 2014 at 17:25 #31070
Nick_G
Participant
@nick_g
James Coombes Engine
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28 October 2014 at 17:25 #168036
Nick_G
Participant
@nick_g
.

With a box of bits :-

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

Nick
28 October 2014 at 18:22 #168041
Boiler Bri
Participant
@boilerbri
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
28 October 2014 at 21:58 #168055
GaryM
Participant
@garym
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
28 October 2014 at 23:06 #168065
Nick_G
Participant
@nick_g
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.

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

Nick
29 October 2014 at 01:27 #168069
Ed Duffner
Participant
@edduffner79357
Is it finished yet?

Would a scribing block give you the accuracy Nick?
29 October 2014 at 19:34 #168127
Nick_G
Participant
@nick_g
Posted by Ed Duffner on 29/10/2014 01:27:19:

Is it finished yet?

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

Nick
30 October 2014 at 22:44 #168206
Nick_G
Participant
@nick_g
.

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

Nick
31 October 2014 at 19:08 #168260
Nick_G
Participant
@nick_g
.

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
31 October 2014 at 19:20 #168261
Boiler Bri
Participant
@boilerbri
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
31 October 2014 at 19:54 #168264
JasonB
Moderator
@jasonb
That's comming on well, don't polish those columns up too much, the paint won't stick
31 October 2014 at 20:46 #168266
Nick_G
Participant
@nick_g
.

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
1 November 2014 at 10:07 #168292
JasonB
Moderator
@jasonb
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
1 November 2014 at 13:52 #168323
Nick_G
Participant
@nick_g
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. )

Nick
1 November 2014 at 16:15 #168344
Boiler Bri
Participant
@boilerbri
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
1 November 2014 at 17:33 #168352
Neil Wyatt
Moderator
@neilwyatt
If they need a volunteer to dispose of the contaminated whisky, I'm sure I can help.

Neil

<starts searching out filter papers>
5 November 2014 at 21:45 #168725
Nick_G
Participant
@nick_g
.

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 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.

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
5 November 2014 at 22:03 #168726
Boiler Bri
Participant
@boilerbri
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
5 November 2014 at 22:07 #168727
Boiler Bri
Participant
@boilerbri
Just watched the vid. What's the coloured packings ?

Bri
5 November 2014 at 22:08 #168728
Nick_G
Participant
@nick_g
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.

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

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

Nick
6 November 2014 at 07:27 #168745
JasonB
Moderator
@jasonb
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 that

Comming on wel though
6 November 2014 at 07:40 #168747
Jerry Wray
Participant
@jerrywray14030
While thinking about whiskey (whisky?)my mind went back over my own experience to recall when I was heavily involved in lining of steel drums. Our lab, probably the most expert in Europe discovered that resistance to gin and whiskey was the most difficult to achieve, more so than almost all other chemicals.

It's not the finish that's important but the characteristics of the polymer.

Jerry
6 November 2014 at 11:01 #168764
Ian S C
Participant
@iansc
Nick, on the flywheel casting there should be packing under the spokes, so that the clamp presses down on the spoke and the packing against the face plate. To get adequate clamping without the intervening packing risks breaking the spoke, or if like most of my flywheels the spokes will bend as they are made of hot rolled plate.

Ian S C
14 November 2014 at 21:15 #169608
Nick_G
Participant
@nick_g
.

Bit of help please guy's.

Whats the best machining process / order to turn this rascal :-

Into this :-

I presume the spigot in the bottom of the casting is to assist in holding during the process.

Many thanks, Nick
14 November 2014 at 22:42 #169620
Paul Lousick
Participant
@paullousick59116
Nick,

I would center it in the lathe chuck, face the back and turn the boss first which will give you a datum face and location diameter to machine the opposite sides and remove the location spiggot.

The drawing does not show any surface finish or tolerance for dimensions. Check it they are required before you start machining.

Paul.

Edited By Paul Lousick on 14/11/2014 22:43:55

Edited By Paul Lousick on 14/11/2014 22:47:25
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