Re: Poorly Fitting Holders Dixon Type QCTP Myford Size

On Apr 29, 12:14 am, "news.blueyonder" <arc...@xxxxxxxxxxx> wrote:
Had the same problem with reproduction Dickson T1/S1 holders. Got so
hacked off at the crapness of the reproduction parts and the silly
cost of the real ones that I flogged it and bought a piston type
holder from Arc Euro. Lovely piece of kit,works a dream. Added bonus
is that the holders are a "dovetail" design and can therefore be
easily made at home.

Charles

This is very relevant to my own thoughts. My recently acquired Boxford AUD
came with a Dixon tool post and a couple of holders and I was thinking about
buying some additional holders at Harrogate although the S0 is pricey
compared to the S00 size for a Myford. I have had a look at the piston type
from Arc but I am unsure about how the tool locking mechanism works. The
picture seems to show that the tool holder is pushed away from the tool post
locking against the dovetail. This doesn't seem to me to be as rigid as a
Dixon type where the tool holder is pulled back against the tool post. Have
I understood the piston type locking arrangement or is there something else
going on?

Archie

Archie, I have one of the 200 series piston type toolposts on my
BH600. While I was initially concerned as it does lock as you
describe, in practise it has worked extremely well. Even with heavy
and intermittant cuts I have not sensed any lack of rigidity or had
the tool come loose. The locking movement is very small and the cam
seems well up to providing sufficient force to resist the cutting
loads. It also has the advantage that the holders are easy to make. My
only comment would be that for some reason it seems to need very firm
tightening to lock the block to the topslide.

On my own AUD I have one of the John Stevenson toolposts that I made
myself and that also works extremely well. It also has easy to make
tool holders. To be honest with the piston type being so reasonably
priced these days from suppliers like ArcEuro I wouldn't make my own
again.

I also have a Dixon on my Myford and that is superb. Having all three
types in use, I have to say that given the choice with money not an
issue it would be a Dixon on every machine for me (just my personal
opinion). In the real world where I have to pay for the tooling I
would have no hessitation in recommending the piston type as a good
second choice. When I decided to make my toolpost for the AUD it was a
financial decision. I had looked at the Dixon type that is available
for the machine, but while the basic set always appears available, the
individual tool holders regularly seemed to be in short supply. I
don't know if that is still the case today.

Best regards

Keith

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