Toolholder Mod.......

[Stilldrillin]

One of those, "why didn't I think of that before", mods.......   


I've recently fitted a Dixon type toolpost to my mini lathe, and the tool pockets are a little shallow.

My favourite knife tool has to be canted to the left, to provide clearance. And canted ever more as it is reground, until the tool will no longer locate under the first screw.




So, I milled the rear end of the pocket 1/4" deeper, using a10mm carbide, 3 leg endmill.......




Finished, deburred........




Lots of adjusting room now........




David D.

[andyf]

  Well, you've done it now, Dave, but I think I might have taken the alternative route of tapering the side of the tool shank, unless it was horribly hard.

Andy

[Stilldrillin]

Not hard Andy.

But, I thought it better to mod one of the holders, rather than every tool I buy in the future....... 

David D

[Anzaniste]

I slacken the tool post hold down bolt and twist until the angle presented by the tool is what I want. Takes seconds.

[Stilldrillin]

I slacken the tool post hold down bolt and twist until the angle presented by the tool is what I want. Takes seconds.

Yes..... But.

Having to align at each change, defeats the purpose of QC toolholders.

I like to keep mine aligned square, and locked.

Am I the only one who's had an angled toolpost creep (twist), under cutting forces? 

David D

[andyf]

No, you're not alone 

I scraped the underside of mine flat, to increase the contact area and friction.

Andy.

[Stilldrillin]

Ah! Thanks Andy....... 

The present cross slide top surface, base block, and toolpost, will almost wring together.

The original set up, left a lot to be desired....... 

David D

[Brass_Machine]

Nice fix David.

Just curious, why would future tools have the problem as well?

Eric

[Stilldrillin]

Thanks Eric.

Future knife tools will also need canting to the left, as their cutting edge is gradually sharpened away.......

David D

[Divided he ad]

Looks like it does the Job David 

The way I see it we all make and mod' stuff to our own specific needs.


If it does what it was intended to do then it's a good mod' 






Ralph.

[Stilldrillin]

Thanks Ralph! 

Yer'l do for me........ 

David D

[Brass_Machine]

Thanks Eric.

Future knife tools will also need canting to the left, as their cutting edge is gradually sharpened away.......

David D

Ahh! Ok!

[lordedmond]

David

just a heads up regarding those tool posts ( yes I do use the same style ) is that all of the holders that you buy shall we say cheaply ( the proper ones are £40 each ) from rotagrip post is £150

My point is that they are not all made to the same hymn book I have just replaced my tool post due to the old one failing  ( cracks in the wedges ) I have had to scrap a good few of the pattern ones as they would not pull up with the worst  having a 0.75 mm gap no wonder the old post had trouble

so please when you buy some more it worth checking

BTW if you have a tilt head mill they are very easy to make the main slot is cut with a myford tee slot cutter and the Vee's are 48 mm to the points , bung a 12mm ( you do need that size to cut both the Vee faces at one setting ) tilt the mill head to 45 deg and mill away they should be 7.5 mm deep but do check you post 25 mm square stock is OK 58 mm long


Stuart

[Stilldrillin]

Thanks for that Stuart!   

I had a conversation the other day, with the "quality" supplier, to the effect I had bought from "Ratner's"....... 

For the type of work I do, this quality is quite adequate......
And, frankly, for the years I have left, it's not worth investing the price of a new lathe, in just a toolpost and 6 holders! 

I have the post and four holder set, and another pair of holders from a different supplier. They all fit together nicely. So far.... 

But, I will keep a wary eye open for any future problems........   

David D

[lordedmond]

yes David

please be aware its very obvious when they don't fit you can see it , otherwise they come loose under the cutting pressure , as I said its mainly the Vee's but the flat back can be too thick

glad yours are OK


Stuart