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| Shopmaster/Shoptask Discuss Shopmaster/Shoptask machinery here! |
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Hello all, I have a Patriot VFD purchased in May. Have made many of the mods to eliminate vibration as well as upgrades I have made from ballscrews, new brackets and mounts for steppers and so forth. I have converted it to total cnc, with 16" travel in Y as well. still don't have 4" travel in Z as advertised only 3.5" ? "scratching head" My problem is this. How the heck do you adjust the lathe spindle to make it parallel to the X ways? It is off by 0.011 and this is causing a tapering of approx 0.001 for every inch of travel along the axis. It makes for useless shafts if you know what I mean ![]() I know there are two mounting screws on each side of the base to head mount. What I'm not sure of is the center pins? They are threaded internally? I know that most mating surfaces on this have location pins which I have had to remove in order to get things indicated in. Now I must tackle this as the last hurdle. Anyone know the procedure for this machine? Thanks in advance. MK |
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#3
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Thanks I37, I suspected it might be something like that as far as the tapered pins just didn't want to try until I was sure of the design. I'll try and get some PICs up of the Y table. Basically, I used a21" ball screw. Moved the bearing points out 2" at each end. Made a new Stepper mount. I had to move the ballnut mount approx 1.5" towards the front of the machine. This still allows 2/3rds of the table in the ways. Gib adjustment becomes a little more critical though. So far it is doing well. I have had my trials and tribulations though with this project. More so on the vibration issues. As you may know, steppers and vibration do not work well together. Midband resonance becomes a problem and lost steps as a result. I have found using polyurethane rubber. http://www.mcmaster.com note that this is the HARD in there durometer. part#8716K42As a spacer between steppers and mount points as well as neoprene clad washers for the screws that holding them, eliminates most resonance problems. Also good connectors using a Buna N style for direct connects or Pulleys with belts make a large difference. Even still, sometimes dampers to the rear output shafts are also required. Again thanks for your reply. MK Last edited by Mkroe; 08-04-2010 at 05:37 PM. Reason: link not working |
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