Bolt-on Vs. VDI turrets on ST-10

anrapa · Jun 15, 2017

Hello everyone!

I'm about to order (today) and ST-10 and I can't really find a lot of informations regarding the differences between the two turrets.
The bolt-on is 1800 euro more but I don't understand is there is any advantage over the VDI.
Maybe tool holders are cheaper?
Any suggestion?
Thanks!

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wheelieking71 · Jun 15, 2017

Only benefit is: slightly quicker tool-change-outs if your VDI tooling is already assembled (you need a lot of VDI holders for that to always be the case)

Bolt-on is much more versatile, AND cheaper. Sounds like a win to me.

anrapa · Jun 15, 2017

Thanks!
The actual turret is cheaper when Bolt-on. Are you referring to the tool holders?
Also: I don't want driven tools so I won't but the 15.000 option for that but I'm interested in the lathe spindle orientation. It seems to be like a poor man version of a C axis. Can it be used for engravings?

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wheelieking71 · Jun 15, 2017

anrapa said:
Thanks!
The actual turret is cheaper when Bolt-on. Are you referring to the tool holders?
Also: I don't want driven tools so I won't but the 15.000 option for that but I'm interested in the lathe spindle orientation. It seems to be like a poor man version of a C axis. Can it be used for engravings?

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No engraving without live tools. Only thing that pops in my head, that would make spindle orientation useful, is broaching.

anrapa · Jun 15, 2017

My idea was something like this: Haas TL-2 Lathe Demonstration - Peck Drilling with Spindle Orientation - YouTube

I asked and it looks like that even if the lathe is capable of a full C axis (which is needed anyway if you want to do spindle orientation) you need to buy the 15.000 option for live tools.

I ended up ordering the Bolt-on turret: it has better clearance for tools.

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Job Shopper TN · Jun 15, 2017

Too late, but I'm with Wheelie. It may just be the older style of VDI turret with threaded shank, but our SL30 has a severe lack of rigidity that comes down to the VDI turret. Our same-vintage SL20 with bolt-on turret is much better... it may come down to one particularity of one machine or the other, but that's what I see.

anrapa · Jun 15, 2017

The seller said the same, the bolt-on is much more rigid, an additional reason I chose it. Once it gets here in 3 months I will try to make the "poor man c axis" work for engravings on the surface. I only work on brass, rigidity or holding power shouldn't be a problem.

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