I made a video on Youtube about making a lantern chuck which I needed to grip a batch of M5 cap screws so I could machine a domed end to the threaded shaft, then polish them. A few folks have asked for the drawings. If I made another of these, I’d probably make the brass collar 10mm longer and the openings 15mm longer, and maybe make the collets slightly smaller. I don’t have a drawing of the insides of the shaft, it is just a simple magnetic hex-socket fitting as used to hold screwdriver bits, in a hole reamed to be a sliding fit. I milled a slot in the side and fitted a dog-point grub screw to prevent rotation, then used another grub screw in an M6 tapped hole at the rear end to fix the position of the bit-holder. Finally, I made a pointed locking grub screw to clamp the other grubs screw in place. Details are on https://youtube.com/ and drawings are here. I can send the DXF on request, I can’t upload it here
Many thanks for sharing this drawings.
My condolences for the loss of your wife Caroline
Greetings Ronn
Thank you for posting the Youtube video.
I’ve always wanted to build one of these and now I’m going too. That magnetic insert bit holder is a fantastic idea.
I would love to have the drawing in DFX.
John
I’ll try to remember to post DXF format tomorrow
Neil
Would love to come hear you give your lecture in CT.
Thanks for the drawings. I like your attitude of an informed chose of my shop my reasons for or not wearing gloves or long sleeves.
I would like to make one of these. Do you have the DXF file for it please. Thanks.
Hi Gavin, I made this up as I went along, I’ll see if I can find the drawings. For M2 and smaller, watchmaker’s lantern chucks are probably better. Bergeon and Horotec make them. There’s another design that also works better for small screws, see https://youtu.be/WtYfRUnuDrE?t=305. Problem is with mine is that concentricity is limited by the quality of the threads. The other style doesn’t have that issue, but you need a tommy-bar to tighten the pressure pad. I think a better design might be a hybrid, with a big brass knurled collar and an anvil like mine but with two ears for the collar to press against for tightening