Hi, I have been using my Orac for some time now and would really like to have an auto chuck for bar feeding. I recently aquired a Burnerd collet chuck which takes the EC collet range. These are usually fitted to Colchester lathes, Fitting it to the Orac is not an issue but will I encounter other pro...

Hi Dave, I'm going to fashion a magnetic cup holder just for the job. My VFD is a Mitsibishi Freqol connected to a purpose made A to D converter which has 8 port pins. I had to write my own macro to control it. Trouble is, I really need to use G96 and this setup wont work. Thanks for the link to Dig...

Hi Dave, The machine was sold to me that way. I wouldn't know why it was as I couldn't even cut mild steel without some chatter. I do know the VFD is a bit underpowered for the machine as it now struggles to provide the 2000rpm that the previous owner was proud to show me. I also found that the slid...

Hi, Just to end this post, Yes my spindle bearings were slack as hell. I was also suprised at the amount of force needed to tighten the spindle locknut to take up the slack. Once adjusted to my satisfaction and an hour test run, temperature measurement by sticking my hand on top of the headstock and...

Hi Dave, You could still use your drive boards if you use opto isolators on the step and direction pins. A couple of resistors and vero board and maybe use opto isolater 1LQ74 or similar.


Hope this might help..




Kind Regards
John

Hi, Duh, I've read the specs (after I posted the last) and the bearings are taper roller. So when I tightened the shaft lock nut why didn't the shaft become stiffer to turn? Also I've been reading the info on the SKF website and they recommend that a preload should be placed on the taper roller set....

Hi, Thanks Admin, thats helpful. Cheers Dave, I was beginning to worry about the bearings being too tight. I can remember when I tightened up the nut as far as I could, there felt no stiffening if the spindle shaft when the nut was locked tight. I did the usual and slackened off one notch of the loc...

Hi Dave, Yep I'm still having problems and I think it is due to the machine now. I thought I'd cured it when sorting the computer and after the refit I loaded a file that cuts a 5/8" bar to profile and it cuts that no problem at all apart from while cutting you can hear a faint note of the same soun...

Hi, I have recently aquired an orac and I have a problem I cant track down. The problem is that when cutting steel with any cutting tool there is an under lying vibration tone from the tool just like it is going to chatter and when it gets to the end of the cut I get a heavy chatter/vibration. When ...