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Colchester Student Mk1 Won't Start

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Richard Kirkman 129/12/2020 11:56:48
308 forum posts
760 photos
Posted by Herman van der Merwe on 29/12/2020 05:38:09:

Me thinks those are oxidized aluminium. Was the raw stock stored in a sealed container of sorts?

It was just some 20mm diameter. I didn't think oxidization would have penetrated that deep? That was immediately after a cut of around 1mm from the diameter. The raw stock is just kept on a shelf in the garage. I've not seen it on the other aluminium I've been turning. But I don't know what type this aluminium is, I was given it when I went to Scarborough.

Howard Lewis29/12/2020 12:50:26
4678 forum posts
10 photos

Not a metallurgist, but crystalline boundaries produced during the extrusion process?

Localised heating produced by the carbide tool?

I e Does the same happen with shallower cuts, or with HSS?

Someone on here MUST know

Howard

john fletcher 129/12/2020 13:00:14
676 forum posts

Hello Richard, I see more progress with the lathe. All the other bits and pieces have almost gone from Howard workshop clearance. Lathe went to a club member and mill to a club members son, all local. What a job Brian and I had, there was quite a lot of metal as well to be moved, and access wasn't good. either so all had to man handled. Happy new you to all and I'll be looking out for Part 3 when its published.. John

Phil Whitley29/12/2020 18:56:13
avatar
1317 forum posts
147 photos

George Lodge at 80 English st in Hull have a good stock of NOS leather seals Richard, and they are real helpfull. Sorted me one out for my old Ben patents 22cu/ft/min compressor!

Phil

Edited By Phil Whitley on 29/12/2020 18:58:31

Edited By Phil Whitley on 29/12/2020 18:59:04

Richard Kirkman 129/12/2020 20:17:05
308 forum posts
760 photos

Howard, I'm not sure was much heat in the cut, it wasn't a massive cut. I didn't get time to try shallow cuts or any turning today, the car was in the garage.

Hi John, I'm glad to hear the toolings all gone to new homes, I'm definitely still using mine as much as I can! Happy new year to you too!

Thanks Phil, I'll look into them if I need to. I hope you've had a nice Christmas, especially considering how much you love it! cheeky Bah Humbug

As for today's progress, I've attempted to tame the leak.

This was the leak when I got home

pxl_20201221_183559255.jpg

And this was the leak today. Much more oil

pxl_20201229_160847098.jpg

I suspect the bolts and things have shrunk slightly due to the colder temperature in the garage. Alongside using the lathe heating up the oil will increase its viscosity so it'll leak faster.

Luckily I have been doing some wood turning, so it was very easy to mop up the oil. I haven't used this method before, I was surprised how well it worked with nice dry shavings. Very minimal mess!

pxl_20201229_161828501.jpg

All clean once again. Much easier to see future leaks!

pxl_20201229_165309017.jpg

So once it was all cleaned I went to where I suspected the leak was coming from

pxl_20201229_162444306.jpg

The bolts holding these gaskets tight were not fully tightened as snugly as they should be. So I have just tightened them up a little more. Still not overly tight, but I think they're good now

I checked to see if the oil seal in there had leaked as well, but it seemed dry when I stuck my finger in the slot. Very surprising. It looks like I've made it work.

Anyway I'll turn some more tomorrow. Last day at home so I need to make the most of it. I'll do a little turning playing with the surface finish on that bar, I'll go deeper too and see if its still there. And hopefully warming the lathe up will tell me if it leaks or not! If not, new gaskets need to be made

Happy New Year to all!

Herman van der Merwe30/12/2020 07:16:00
avatar
180 forum posts
Posted by Richard Kirkman 1 on 29/12/2020 11:56:48:
Posted by Herman van der Merwe on 29/12/2020 05:38:09:

Me thinks those are oxidized aluminium. Was the raw stock stored in a sealed container of sorts?

It was just some 20mm diameter. I didn't think oxidization would have penetrated that deep? That was immediately after a cut of around 1mm from the diameter. The raw stock is just kept on a shelf in the garage. I've not seen it on the other aluminium I've been turning. But I don't know what type this aluminium is, I was given it when I went to Scarborough.

At what depth do these disappear? It can oxidize quite quickly especially in the absence of oxygen.

roy entwistle30/12/2020 09:57:37
1337 forum posts

It can oxidize quite quickly especially in the absence of oxygen. ?

Roy cheeky

Oven Man30/12/2020 10:36:05
avatar
118 forum posts
8 photos
Posted by roy entwistle on 30/12/2020 09:57:37:

It can oxidize quite quickly especially in the absence of oxygen. ?

Roy cheeky

It's the same principle as Richards oil viscosity increasing when it gets hot. But we all know exactly what he means.

Peter

Herman van der Merwe30/12/2020 12:28:21
avatar
180 forum posts
Posted by roy entwistle on 30/12/2020 09:57:37:

It can oxidize quite quickly especially in the absence of oxygen. ?

Roy cheeky

Sorry, the correct word would be "corrode" in the absence of oxygen. Oxygen is the only thing protecting alu. Take it away and you have many problems. Richard, if I remember lives next to the coast so he most probably is seeing inter-granular corrosion.

Herman van der Merwe13/01/2021 09:14:31
avatar
180 forum posts

@Richard you have lost some images on page 1 ...

Richard Kirkman 113/01/2021 10:21:21
308 forum posts
760 photos
Posted by Herman van der Merwe on 13/01/2021 09:14:31:

@Richard you have lost some images on page 1 ...

Thanks Herman

They're on a post by SillyOldDuffer so it's not too do with my album. I presume something may have happened on their end. Deleted the album perhaps?

All my pictures are still there

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