Lots of posts on the subject, so better to see what has been posted, example below. A wedge should be inherently more accurate as it both pulls the holder down and locks by pulling inwardly. A piston type is more likely to rock if all the surfaces are not machined perfectly true. There are more contact areas with a wedge system, and the repeatability is claimed to be better by those that have used both (see discussion in link below and other posts). There are other factors so not worth repeating what other's experiences with both systems, and comments. On a smaller lathe, both will work well, but you won't find any industrial machines using a piston style QCTP. The quality of the QCTP is also a factor, I have read a number of reviews on the Bostar, people seem very happy with it's performance at a budget price point. Phase II also has good reviews, but at that price point individuals notice a significant improvement going with an Aloris or Dorian QCTP. I have used Phase II, Aloris and Dorian, and the latter two work much better with a smooth mechanism, accuracy wise they are all about the same.
Jbolt looked at repeatability of both and found that the wedge style was more consistent with less error, and this seems to be the experience of others. Appreciate Jbolt's contributions, and others.
My recommendation is get a good QCTP holder and save your money on inexpensive holders, Darkzero (WIll) did a review and found they all repeated accurately. Nice when someone actually has some tangible comparison, so THX to Will for spending the time on this.
www.hobby-machinist.com
Tool Posts..... Piston or Wedge?
I have a Yuasa BXA size piston tool post and am not very impressed with the repeatability. I am considering an Aloris Wedge type and can't seem to get an answer as to weather it will be any better. I spoke to a distributor that said there is no difference between piston and wedge as far as...
www.practicalmachinist.com
BOSTAR AXA Size Wedge Type Quick Change Tool Post Set for Lathe 6 - 12 for sale online | eBay
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Jbolt looked at repeatability of both and found that the wedge style was more consistent with less error, and this seems to be the experience of others. Appreciate Jbolt's contributions, and others.
What's the Differance? Tool Post Styles, Piston or Wedge
Ok, so what's the difference between a piston QCTP and the wedge type? Pro's and cons of both? Shar's has the AXA piston type in a set for $114. and the wedge type for $183. Thanks, Tim
www.hobby-machinist.com
My recommendation is get a good QCTP holder and save your money on inexpensive holders, Darkzero (WIll) did a review and found they all repeated accurately. Nice when someone actually has some tangible comparison, so THX to Will for spending the time on this.
Qctp Holder Review Part 1
I have read a lot of discussions on the pros and cons of QCTP holders from various manufacturers but never a head to head comparison so I collected four of the commonly used BXA-1 holders for review. I have had inexpensive import QCTP's and more recently a new Aloris QCTP . Just from an...
www.hobby-machinist.com
