MEW 156 tangential toolholder angles

[John CoatesParticipant @johncoates48577]

Had a go at making one of these yesterday. First problem to overcome was that the width of the jaw opening on my new K4 Vertex vice freshly bought at Harrogate was insufficient for the design shown in MEW 156 or what I wanted for the size of my QCTP. I would have to hold mine with the shaft lengthways in the vice, not perpendicular as shown.

 

I ended up milling two blocks with the 12 degree angle on one side. When clamped above and below the tool blank it held it at the correct angle to allow the flats and the groove to be milled.

 

I felt quite good about overcoming the problem ….. until I realised I had made another newbie error. I’d had the tool blank upside down. Instead of the angles being cut on a L lying on its back with the foot down, my foot had been up. Hence the eventual cutting height of the tool would be too high!

 

Ah well. At least I’ve proved the two 12 degree blocks work. Time to cut another tool blank !

[chris stephensParticipant @chrisstephens63393]

Hi John,

If you start with a length of round stock held horizontally in your vice, which is rotated on its base to 12 degrees, to cut your 1/4 slot and clamp screw hole. The next part is to again hold the bar horizontally but with the slot face held at 12 degrees to the vertical, and then square up the rest of the holder. This all may sound complicated but it is not, it just takes a little longer to remove all the metal that is not to be part of your shiny new holder.

If you want clarification of any point do ask.

chriStephens

[John CoatesParticipant @johncoates48577]

Posted by chris stephens on 23/05/2011 00:40:58:

This all may sound complicated but it is not, it just takes a little longer to remove all the metal that is not to be part of your shiny new holder.

If you want clarification of any point do ask.

chriStephens

Oh that’s clever, and so blummin’ obvious! Obviously I have a long road still to travel on the path of newbieness.

 

I am pressing on with the ones I was maing as I did cut two tool blanks but as these will be first attempts and no doubt as rough as a docker’s fishwife I shall bear your suggestion and previous design in mind.

 

But then again things suffered a set back with the bolt holding the cone pulley in my mill shearing, leaving the remains buried in the shaft. So at them moment I am without a mill until I make an adapter to get it all up and running again. The brain was on fire at 4.30am this morning so I got up, made a mug of tea, went into the garage and cleaned and tidied the bench and go the motor off. Several measurements later I was sketching up a design on the white board.

 

Nil desperandum

 

John

[chris stephensParticipant @chrisstephens63393]

Hi John,

If you kicked yourself every time someone points out the obvious, you would be a contortionist with a very sore arse.

You can’t know it all right away and as a famous scientist said, “if I can see further, it is because I stand on the shoulders of giants”, learn from others and always file away techniques for later. Soon enough you will be doing it without having to think about it too much.

chriStephens

[John CoatesParticipant @johncoates48577]

Posted by chris stephens on 23/05/2011 11:33:13:

Hi John,

If you kicked yourself every time someone points out the obvious, you would be a contortionist with a very sore arse.

chriStephens

Well I’ve just finished this in its rough form and put a 1/4″ piece of tool steel in it without grinding the top relief (rake?) on it and took a test cut. I am well impressed. It cut a nice smooth finish on a piece of rough steel. So now I need to pretty it up and get that grinding rest made.

Thanks all for providing the inspiration and the know how to make this happen

 

john

[chris stephensParticipant @chrisstephens63393]

HiJohn,

Glad to be of help, and the fee will be to help the next guy who needs any.

chriStephens

[Norman Willcox 1Participant @normanwillcox1]

I cannot find the free download MEW 156. Help please!

Do I understand that Chris Stephens sells tangential tool holders?

I would also like to know how to make the square hole.

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