Chuck backplates

[Kiwi BlokeParticipant @kiwibloke62605]

At some time in the future I will have to make some chuck backplates for an Emco V13 lathe. The spindle nose is to DIN 550 22, size 4, so a short taper provides radial alignment, and the backplate clamps up to the flange. A really-well made backplate will ‘stick’ to the spindle tightly enough to support the chuck when the clamping bolts are loosened. Here in New Zealand, getting materials in small quantities can be a big problem. I think a malleable cast iron would be the best for such a backplate, but I suspect the best I’ll be able to get is some variety of (Chinese) steel. Would this be likely to be OK? Would there be a risk from similar materials being in tight contact? Is steel routinely used for backplates? Am I over-thinking this (as usual…)?

[JasonBModerator @jasonb]

I’ve got a couple of steel backplates, probably EN3. I also made a similar DIN backplate for the Emcomat 8.6 that I had previously from unknown steel

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