Gallery, Projects and General > Project Logs
Project: Reconditioning of my 250x550 Lathe (Very Picturheavy)
stefang:
Resurecting from the dead...
Sorry for the long period for the next post, but I had a lot of work other than my homeshop ;)
--- Quote ---On what basis did you decide how big to make the pockets for Moglice ?
--- End quote ---
I made the pockets almost as big as the bearing surfaces, leaving only a small border of castiron so the moglice will not run away while beeing molded to the surface plate. Moglice has also a minimum thickness of 1mm or it wont hold up to the surface.
And I saw, that I used a wrong picture up there, as measuring the perpendicularity of the side of the cross slide, here is the right one:
http://gtwr.de/hbm/IMG_0234.jpg
Only 0,016mm out of true on the whole lenght after scraping..
But there are also a few new pictures:
The reworked feed-gearbox, painted on the in and outside, new bearings, new seals, all cleaned out:
I found that old electric cabinet at my machine supplier and got it cheap (and he was relieved that he got rid of it..):
After a bit of rebuilding, wiring and a brand new Omron VFD, I got this:
Put on the machine, notebook hooked up for programming:
The Omron is pretty nice to program, and with the notebook hooked up it just looks cool ;)
The bedslide got also fitted to the bed, here with the overworked crossslide and the new gib:
Machining the new closing gib for the bedslide from a piece of hot rolled steel:
I also made a new, more massive gib:
New one on the left, original chinese made on the right, I think you can tell the difference ;)
Fits on the bedslide:
Here is another problem of the original design of the topslide, the mounting to the crossslide:
Its just idiotic, as, when the screws of the clamp are tightened, the cross slide is warped. And to top it all of, the topslide has very little support.
So i made a new baseplate and clamp...
Here is the clamping plate:
And the new base plate:
Boring to final size:
Fits :)
Now the top slide is supported on a broad base and the mount to the cross slide will not warp it any more.
Thats the lathe so far:
At least now I have a partial lathe to make parts for itself...still not finished :D
I made a set of new scale rings for the bed, cross and top slide:
Machining on the lathe:
Engraving on the cnc milling machine:
Top slide done:
Bed slide:
Cross slide:
The numbers are not engraved, as I have no cam system that supports a rotary axis, so I stamped the numbers manualy with stamps, a hammer and the MK I Eyeball :loco:
And now I have something special: I thought that a rack and pinion style tailstock would be very cool on my lathe...after a few beers and consulting a good friend of mine I got a plan, so I ordered a round rack and a 12 tooth gear:
The rack got machined down:
The tailstock ram got bored out (oversized to the rack) and I aligned it all together and glued it with JB Weld:
After setting and cleaning, it fits the tailstock:
A bearing block for the gear is machined from a chunk of hot rolled steel:
Milling out and boring the hole for the rack:
The hole for the gear is machined out:
Testfit:
The bearings in their flanges:
The shaft that will hold the gear, note the surface finish my lathe now produces :wave:
Drilling the holes for the handles, note the very sturdy setup ;)
All put together:
Thats it for today, I hope that were not to much pictures..good night :)
Stefan
philf:
--- Quote from: stefang on May 23, 2012, 07:55:18 PM ---The numbers are not engraved, as I have no cam system that supports a rotary axis, so I stamped the numbers manualy with stamps, a hammer and the MK I Eyeball :loco:
--- End quote ---
Hi Stefan,
Super work - again! :clap:
I haven't tried it yet on my CNC but you can simply draw out the scales flat including the numbers and substitute the A axis for the Y. Calibration is simple.
Does the round rack on the tailstock have a hole through it? If not, how do you eject tools from it?
:beer:
Phil.
ieezitin:
Stefang
Nice job there fella I just got to reading the whole thread today and it was an enjoyable experience.
Can you clarify one thing for me, when you milled out the hollows on the base and then you poured the Moglice in did you have to machine that surface or is the pour the finished product. If it is the finished deal can Moglice be machined?
Many thanks Anthony.
stefang:
:wave:
--- Quote ---Can you clarify one thing for me, when you milled out the hollows on the base and then you poured the Moglice in did you have to machine that surface or is the pour the finished product. If it is the finished deal can Moglice be machined?
--- End quote ---
If molded from a ground surface, or from the stone surface plate, it is ready to go. But it is able to be machined and handscraped, no problem there. If cast from the surface plate or a ground surface, oilpockets are a good idea to be scraped or machined in.
--- Quote ---Does the round rack on the tailstock have a hole through it? If not, how do you eject tools from it?
--- End quote ---
Right, drilled a hole trough it and insert a loooooooong screw with a handle on its end to eject the tools :)
Stefan
Noitoen:
Do you have a braking resistor on that Omron VFD? It doesn't handle quick decelerations very well especially with some inertial load.
I have one at work, driving a magnetic cylinder and every time I had to change to a lower speed, it would trip due to the over voltage from the motor's regeneration. The braking resistor solved the problem.
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