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Parting Off

Parting off tools and examples for Cowells and Maximat 7 lathes

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Ger28/08/2019 17:51:44
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9 forum posts
1 photos

 

I make boiled and steam engine fittings, small nuts, and parts.

 

Edited By Ger on 28/08/2019 17:53:14

Howard Lewis28/08/2019 18:43:45
7227 forum posts
21 photos

Duplicated Thread ?

Howard

mechman4828/08/2019 20:30:47
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2947 forum posts
468 photos

Boiled engine fittings...surprise devil ? What gas mark ?

George.

Ger29/08/2019 14:52:53
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9 forum posts
1 photos

Hello George,

You posted a reply to my video post, "Boiled engine fittings...? What gas mark?"

I have no idea "What gas mark?" means.

I make boiler fittings. My post had a spelling error. I would think that was obvious to all. Appears not to you.

I had some difficulty with my post. I made duplicate postings and had the spelling error. I tried to correct both but could not.

I had hoped readers would be interested in my video than my mistakes. Apparently you were only interested in criticizing me.

The Model Engineer forum is not for me. You can't correct mistakes and it appears you can't quit the forum either. Not really a friendly place.

And then you have to put up with a smart-ass!

Ger

Michael Gilligan29/08/2019 15:07:04
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23121 forum posts
1360 photos

It's good to see the little Cowells doing some reasonably hard work.

Thanks for posting the video, Ger yes

Welcome to the forum, and please do stay.

MichaelG.

Brian H29/08/2019 15:16:24
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2312 forum posts
112 photos

Welcome to the forum Ger and please don't be put off by some peoples attempt at humour.

I don't have a Cowells but have been meaning to try the rear toolpost on my Boxford. Your video convinces me that would be a good move.

Brian

Martin Hamilton 129/08/2019 18:35:14
188 forum posts

The rear mounted tool post works very well indeed, i use a rear mounted inverted parting tool on my Sherline & it parts with no problems at all even on steel. Aluminium & brass is a joy to part off, you don't tend to get dig in's with an inverted parting tool whether it be a rear or a front mounted tool. Being inverted the rotation of the work piece is pushing the tool away from the work piece preventing dig in's, a more normal position parting tool is pulled into the work piece causing more severe dig in's.

Nick Clarke 329/08/2019 19:18:16
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1607 forum posts
69 photos
Posted by Martin Hamilton 1 on 29/08/2019 18:35:14:

The rear mounted tool post works very well indeed, i use a rear mounted inverted parting tool on my Sherline & it parts with no problems at all even on steel. Aluminium & brass is a joy to part off, you don't tend to get dig in's with an inverted parting tool whether it be a rear or a front mounted tool. Being inverted the rotation of the work piece is pushing the tool away from the work piece preventing dig in's, a more normal position parting tool is pulled into the work piece causing more severe dig in's.

Geometrically the front and rear parting tools are pushed in the same relative direction compared to the rotation of the workpiece.

What prevents the dig in is the 'spring' when a rear parting tool is pushed away from the lathe bed as against the 'jamming' of the tool between the work and the rigid lathe bed.

Another advantage of the upside down rear lathe tool is that chips fall away from the cutting edge of the tool.

Edited By Nick Clarke 3 on 29/08/2019 19:19:11

Martin Hamilton 129/08/2019 20:15:07
188 forum posts

http;//youtu.be/-RZRq0olsxM this explains things clearer.

Nick Clarke 330/08/2019 08:32:09
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1607 forum posts
69 photos

Thanks for that link Martin - it clearly shows how a tool in a rear tool post or upside down in the normal one 'springs' away from work as against 'jamming' when set up in the normal way better than just using the words as I did. A picture says a thousand words and a youtube video can often be even clearer!!

It is a shame that the computer simulation shows a tool so far above the centre though, as that makes the problem bigger than in real life.

Douglas Johnston30/08/2019 09:27:04
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814 forum posts
36 photos
Posted by mechman48 on 28/08/2019 20:30:47:

Boiled engine fittings...surprise devil ? What gas mark ?

George.

Oh, come on, has everybody lost their sense of humour, I for one thought it was funny but perhaps that says more about me!

Doug

Jon Lawes30/08/2019 09:31:27
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1078 forum posts

I think the "smart-ass" comment was intended in a friendly manner. It was a very tame and light hearted bit of welcoming chat by the person who posted it. Whilst I agree a forum should be welcoming and not overly critical I think it is possible to have a slightly too thin skin, or we would only want to converse with sycophantic robots.

You are very welcome, and I am interested in your posts. Teething troubles with posting on forums are to be expected especially as there are so many different types of forum out there!

ega30/08/2019 11:11:33
2805 forum posts
219 photos
Posted by Douglas Johnston on 30/08/2019 09:27:04:
Posted by mechman48 on 28/08/2019 20:30:47:

Boiled engine fittings...surprise devil ? What gas mark ?

George.

Oh, come on, has everybody lost their sense of humour, I for one thought it was funny but perhaps that says more about me!

Doug

When I read the OP from a relative newcomer I was tempted to ask "boiled or steamed?" but refrained for fear of causing offence. He seems, from the commentary on his video - nice lathes! - to be from the US, and is a welcome visitor.

As always, communication would be easier and friendlier if there were a profile to refer to.

ega30/08/2019 15:05:00
2805 forum posts
219 photos
Posted by Nick Clarke 3 on 30/08/2019 08:32:09:

Thanks for that link Martin - it clearly shows how a tool in a rear tool post or upside down in the normal one 'springs' away from work as against 'jamming' when set up in the normal way better than just using the words as I did. A picture says a thousand words and a youtube video can often be even clearer!!

It is a shame that the computer simulation shows a tool so far above the centre though, as that makes the problem bigger than in real life.

You clearly got the link to work but I'm blessed if I can! Would you mind posting the appropriate search string?

Nick Clarke 330/08/2019 17:59:53
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1607 forum posts
69 photos

http;//youtu.be/-RZRq0olsxM

Michael Gilligan30/08/2019 18:04:05
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23121 forum posts
1360 photos
Posted by ega on 30/08/2019 15:05:00:
.
You clearly got the link to work but I'm blessed if I can! Would you mind posting the appropriate search string?

.

Allow me, ega

http;//youtu.be/-RZRq0olsxM

contains a semicolon where there should be a colon ... Thus:

http://youtu.be/-RZRq0olsxM

**LINK**

MichaelG.

.

Edit: But Nick has now managed to conceal the original sin !!

Edited By Michael Gilligan on 30/08/2019 18:05:38

Nick Clarke 330/08/2019 18:18:13
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1607 forum posts
69 photos

Michael - I only realised there was a typo in the original post after posting the link again, but what puzzles me is that I only knew it was wrong when ega pointed it out as even with the typo it worked OK in Edge on Win10, I have just tried Chrome and IE on the same m/c and Safari on the Mac and on all of them it corrects the mistake and loads the page fine, as it does in Android on my phone.

I have not got a Firefox, Chromium Pi or Linux machine up here but I am intrigued so I will check them when I go downstairs, just for my own satisfaction. As the saying goes - To err is human, but to really screw it up just get a computer!! smiley

Take care,

Nick.

Nick Clarke 330/08/2019 18:46:33
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1607 forum posts
69 photos

Well tried it on the other systems and on every combination of OS and browser it automatically corrects http;// to http://

Just all part of life's rich pageant (As Inspector Clouseau remarked on getting out of the pond again frown)

Michael Gilligan30/08/2019 18:57:24
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23121 forum posts
1360 photos

That's interesting, Nick

I've just copied and pasted your original version < http;//youtu.be/-RZRq0olsxM > into a new tab in Safari, on the iPad; and it spots < http; > and displays the message:

Safari cannot open the page because the server cannot be found.

Predictably, however ... if I just paste < youtu.be/-RZRq0olsxM > it 'knows' what is missing, and opens the video.

dont know

MichaelG.

Nick Clarke 330/08/2019 19:31:50
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1607 forum posts
69 photos

Michael -

Sussed it out I think. I copied the original link in Martin's Post and inserted it as a link in a new post. When inserting the link I used the original link with typo as the descriptive text - but when adding a link in this forum you only need to put the part after the http:// as URL as it preceeds it with http:// automatically when you fill in the form to add a link. It seems to assume the protocol always ends with :// So Martin's link on the post, with a typo was just text on the screen. The URL it pointed to was correct.

So if you click on the link it will take you to the right place. If you copy and paste in anything but Safari on an iPad it will also do so, but not there. Even more interestingly if you have google installed on the iPad it will open a search result - but the first video it suggests is the one wanted.

Even curiouser I think.

Take care,

Nick

Edited By Nick Clarke 3 on 30/08/2019 19:37:00

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