So I have gotten a old (1989) Bridgeport Interact 1 Mk 2 CNC
Mostly hobby. It works well with the tooling that came with it.
It is supposed to use ISO30, using not a drawbar, but it's ... what to call it ... collar? to connect and hold on. With a special nut that grabs its collar.
In fact, there is no hole in the spindle to even hold a drawbar, so it is not an option
Recently I bought a new ER32 collet adapted, and it does not fit.
Checking why, and checking the "ISO30" that came with it, I found the reason is the distance from the collar to the start of the taper is 2mm to far
(see attachment)
According to DIN2080, a+L2 should be 9.6mm and the one I bought is exactly that.
But all the (working) ISO30 I have have a+L2 of 11.6mm
Also D1 seems to officially be 50, but my Bridgeport accepts max 46
I only discovered the a+L2 problem after I had already turned down D1
Questions:
- Anyone else ever run into this?
- And if so, how did you fix it
- There is not, perchance, some place that sells modified nuts for Bridgeport