|
|
Post by Roger on Mar 19, 2019 22:08:52 GMT
Another point. The front toolpost has 2 movable slides between tool and bed, 2 sources of play. The rear toolpost has only 1 slide so half the play Yes, there are two interfaces, but you're not taking up any play as such. The slides are sitting on their faces, not being lifted away like they are on the one interface of the rear toolpost. Don't get me wrong, it clearly works. I don't have to like it from a technical point of view though! |
|
abby
Statesman
Posts: 927
|
Post by abby on Apr 30, 2019 22:00:13 GMT
When using a rear toolpost for parting off the forces involved are pushing the tool away rather than pulling it in , play in slides or headstock bearings doesn't come into the equation.
The action is the same as parting off with the tool upside down and the lathe running in reverse , but safer where screwed on chucks are used.
Dan.
|
|
|
|
Post by deverett on May 2, 2019 9:29:49 GMT
I used a Harrison 4 way turret on a home made rear tooltable, similar in concept to the one shown earlier. I used the rear side of the table to mount the Z axis of the DRO. For the size of projects I used the lathe (M300) for, it was of no use because I could not get the cross slide close enough to the centreline for the tool to cut. I was limited in the distance I could slide the table towards me because of the DRO mounting.
In theory it was a good addition, but in practice not so good. Now the auxiliary boring table that I made to clamp on the cross slide did get a fair bit of use.
Dave
The Emerald Isle
|
|
|
|
Post by coniston on May 3, 2019 12:43:35 GMT
Like others I was told the rear tool post is better due to the forces being directed down into the bed, all I can say is it works perfectly on my Super 7 and my previous ML7. I made my rear tool post from a couple of bits or stock bar, heavy construction and hold a Sandvik tool with 3mm wide inserts. I can easily part off 3 inch steel bar (doing some disc brakes for passenger trolley) with no vibration, shake or tool digging. It really does work. best of all as others have mentioned I don't have to keep changing tools, easily enough with my Dixon tool post but just another operation I don't have to do.
|
|
