| Gallery, Projects and General > How do I?? |
| Proxxon PD400 |
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| wongster:
I'm giving up my search to find out the info on the Proxxon 3 jaw chuck online. I'll go measure them in the next session. The downside of getting a Proxxon is the lack of information on the machine. Can be rather frustrating. Regards, Wong |
| grayone:
I have to admit there is not much info on Proxxon in English :coffee: although I suspect there may be more in German. A word about the proxxon collects and why I have not bought them. Unlike ER collects they are not double slit so the clamping capacity will be restricted to the nominal bore unlike the 1mm range of the ER's. I have bought two sets of ER's the ER20 with MT 2 holder for use in the tail stock and ER25 with a MT 3 holder for use in the headstock both from HK. I have yet to unpack them and even check if the runout is within the specified range or not. I eventually plan to make a holder (I have bought a spare nut from CTC) bored directly on the lathe to ensure max accuracy. This will be a fraction of the cost of the Proxxon ones and more versitile (I hope). CTC have ER 32 MT 3 holders for a relatively small cost that may make some sence until you want to try to make your own holder. Graham |
| wongster:
I changed the Subject to reflect the general discussion. I bought the ER16 with MT1 for the Sherline with collets. These are very convenient like you have mentioned. I can't remember what I clocked the last time but the runout is pretty decent. Wanted to buy a set for the Proxxon but has no idea if the drawbar bolt head can clear the small space at the gear compartment. So I thought of getting those that are mounted on the backplate. Wong |
| andyf:
Wong, changing the subject line doesn't seem to have worked. The big advantage of bolt-on ER collet chucks is that they leave the spindle bore unobstructed. Long stock can be passed through the collet and spindle. Andy |
| wongster:
It didn't :Doh: That's what I thought. Thanks for confirming. I just did a quick measurement of the registration of the backplate. Its 70mm (or more of 69.98mm) across and 2.35mm deep. The one on the Rohm 3-jaw chuck is deeper. So I guess the circumference of the registration boss and the outer face keep the chuck square to the spindle. Measuring the PCD is a little more tricky (or rather, I've no confident of the number being right). The bolts are rather loose when turned into the backplate. From one bolt to another I get 71.61mm (after zero'ing out the caliper with the diameter of the bolt). Some Trigo have to be used next. I've to start revising on the subject. It has been more than 20 years back... Regards, Wong |
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