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| Help needed with my lathe |
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| John Hill:
Sounds like a golden opportunity to build an 'electronic leadscrew'! |
| Bogstandard:
Anthony, Of all the lathes I have come across and had to machine, they all went fairly smoothly. The metal is usually easily machined cast iron, and that can usually be worked on with hand tools, electric drills etc, that saves on trying to get the bed onto a machine for drilling. That is of course if you don't need reccesses and things cutting out, but again, depending how adept you are at drilling and filing, even that can be done accurately by hand, and a cheapo die grinder helps a lot in that department. For marking out such things, I have a large collection of transfer punches. Get someone to help hold the part in position, then feed the punch thru a hole and give the end a tap. That puts the punch mark for drilling your first hole. Drill and tap the hole and mount the part up, making sure it is in the correct position, then repeat with a transfer punch for all the other holes. I find I can get things spot on that way, easily within a couple of thou. I mounted my DRO read heads by doing it that way, and when checked out with a DTI, they were spot on. You always have a bit of fiddle factor anyway, the bolts usually have a bit of play in the holes they go thru. It is very difficult giving advice like this because at this time, it has to be just general stuff. When you actually get the job in hand, then by looking at it, more accurate information can be forthcoming. Like I tell most people, if you get stuck, and you can get the part to me and aren't in too much of a rush, I don't mind helping out. There is always something in my shop requiring machining or fixing that isn't mine. John |
| Jonny:
--- Quote from: John Hill on December 26, 2010, 02:38:17 AM ---Sounds like a golden opportunity to build an 'electronic leadscrew'! --- End quote --- Tell me more, could be quite interesting for those without gearboxes. Know what you mean Bogs just put a 720mm lg scale on X axis armed with drill, centre punch and DTI. The covers and scales are not that accurate from an extrusion but settled on 1 1/2 thou and nil runout on the side just bolting on, couldnt believe it. Y is even better with miniature magnetic type. |
| ieezitin:
Hello. Well I got the information I needed, I joined the Logan group on Yahoo (nice bunch of friendly fellas on there ) and posed the same question on that board, the consensus is that it’s just a matter of milling down the casting of a Logan qc box of a donor 820 model by .341 to make the center of the lead screw match the center of the qc box, because the 200 model was not intended for a qc the 200 saddle gearing is different to a 820 model this has a clutch design, to match the spindle speed with lead screw feed a new gear train needs to be set up. One excellent suggestion from a chap on that board was to install a 820 saddle making it a model 200 / 820, so those are my options to ponder. I will attempt this and would like to have it done in two months, when I get into it I will start a build log. John Hill, I am also intrigued on an electronic lead screw and what it involves and advantages it may have, if you could supply detailed information I would like to review it as if it’s a better way than what I will be attempting to do I surely would give it ago. Anthony |
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