Shed Matters 3

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Stanley
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Re: Shed Matters 3

Post by Stanley » 04 Dec 2018, 04:03

Easiest way to make it run would be to By-pass the regulator box because that's where the problems start from but I'm content to let it lie and get on with another project like beating cancer!
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Re: Shed Matters 3

Post by Stanley » 10 Dec 2018, 06:40

Sorry lads, activity in the shed is temporarily suspended. I am having another operation tomorrow so I am gatting all my ducks in a row!
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Re: Shed Matters 3

Post by Stanley » 12 Dec 2018, 05:57

All went well Lads. Bit of recuperation now but I shall be back!
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"Beware of certitude" (Jimmy Reid)
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Re: Shed Matters 3

Post by Stanley » 13 Dec 2018, 05:05

Making good progress lads. It won't be long..... But at the moment I am being careful!
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Re: Shed Matters 3

Post by Stanley » 16 Dec 2018, 09:16

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I put a toe back in the water this morning and went in the shed. No set purpose, I just needed a potter to get me back into the groove. My first job was to re-sharpen my favourite cutter. This piece of Cobalt HSS is sharpened with a left hand cutter on one end and a right hand one on the other. Having sharpened it I wanted to make sure that each end was cutting on centre without any adjustment needed, all I have to do is swivel the tool post round. The best way to test this is to cut a face on a piece of steel. So I did this and just had to raise the cutter a touch to get both ends singing to the same hymn sheet. Then I cleaned up my swarf. One good job done!

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You won't be surprised to see that my next blow was to touch my milling cutter up after making sure it was backed off and had a good gullet. Then back into the mill.
Not what you'd call tearing trees up but useful checks and it makes sure that whatever I do I know that the lathe and the VM are ready. Sorry it was nothing more exciting, but it's a start after a traumatic interruption!
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Re: Shed Matters 3

Post by Stanley » 17 Dec 2018, 11:16

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Three hours in the shed today! There's an old Scottish saying, "When a man isn't fishing he should be mending his nets." My version of net mending this morning is to check whether Mrs Harrison is turning true or adding a taper. I was going to test the levels first but decided to cut straight to the chase and turn a test bar. I found a piece of bar 20" long and that's what I wanted, then I noticed it was my old friend, the piece of wrought iron shafting! But that just made it more interesting so I faced it at each end and put a good big centre in. The way to get the most length and a true fix in the lathe is to turn between centres so I needed a dead centre at the chuck end. I got the collet chuck out after I had faced the bar and got set up to have the maximum length. Then I looked for a piece of steel, turned it to a uniform diameter and faced it at each end.

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Next job was to set up the catch plate and I got a bit of a shock. I had two catch plates and had used one to make a chuck back a while ago. I got the other one out and found it didn't fit! I don't know how I missed that. No matter, I put the face plate on, first time I have ever used it! Now we need a centre.

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I set the cross slide to 30 degrees and put a point on the centre. By the way, no need to make it needle sharp, you only catch your hand on it later!

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Here we are set up. The dog fits nicely into a slot in the face plate. I have of course got a nice sharp cutter ready. I set up for a 20thou cut and started only to run into horrendous chatter.

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I tried a slower speed and a finer feed and eventually got a reasonable 10thou cut, I wasn't bothered about a fine finish, I could take a light finishing cut to get that.

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It was a long cut but eventually I had it done.

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I wondered how a ceramic cutter would perform, this one is a very heavy shank and I thought it might be more rigid. It started well but then deteriorated rapidly so I abandoned it.

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I used a cable tie to stop the leg of the dog chattering in the slot, it made a big difference.

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This is an old cast steel tool that came out of Newton's shed. Entirely different grind and I Have a fancy to try it when I've got a result. But first I honed a bit more radius on my HSS cutter, set a light cut on a slow feed and a slower drive, 117rpm.

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Much later after a long cut and some overtime we have a reasonable finish. I miked it and there is just a shade over a thou of taper in 18", that'll do me!
While the cut was going on I got the stone out and made a good job of sharpening the old CS cutter. Tomorrow I'll set it up and see how it performs.
If anyone is wondering why I didn't chase that thou out, I don't want to do it by adjusting the tail stock until I have checked the levels. As it stands it's probably more accurate than most lathes and I am not thinking of doing anything so high precision. Not a bad result and very interesting. I think this old piece of shafting is a very bad piece of wrought iron, it has a lot of slag inclusions. I'll bet I could get a better result on a piece of better steel.
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"Beware of certitude" (Jimmy Reid)
The floggings will continue until morale improves!

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Re: Shed Matters 3

Post by Stanley » 18 Dec 2018, 09:48

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I'm playing out this morning, I want to find out how good the old cast steel tool is at handling the wrought iron and seeing if I can learn anything from it. So, the tool is sharp, I honed it yesterday. All I had to do was make sure it was set dead on centre. (You can see the slag inclusions clearly!)

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I put myself in the mind set of a bloke with a treadle lathe who knew there were limits to how fast he could treadle! So, 48rpm and a 5 thou cut. That was OK so here I went for 20 thou and when I had done a suitable amount I moved down to the other end and did the same there then miked both ends. Same result as yesterday, one thou over the full 18" and the same rough finish! (That finish could be where the thou is, it certainly isn't helping!)

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Next I popped my test bar in and all I could find over almost 4" was less than a tenth of a thou. That'll do me!

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I stripped my collets and the faceplate off and put them away and popped the 4 jaw SC on. I put a slug of scrap in and took a 25 thou cut over it.

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I ran the DTI over it and couldn't find anything that can't be put down to the finish. I think my conclusions are that that bar is a lousy piece of wrought iron! The cast steel tool is as good as the HSS within its limits of speed and temperature and Mrs Harrison is quite accurate enough for anything I shall do on it.
I've enjoyed that!
Stanley Challenger Graham
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"Beware of certitude" (Jimmy Reid)
The floggings will continue until morale improves!

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