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Thread: GHA Mill (Deckel FP1 clone)
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1st Oct 2020, 09:18 PM #16Most Valued Member
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If possible I'd add a separate motor for the feeds.
Mine has one motor doing both. The previous owner swapped a perfectly good 2 speed 3 phase motor out *AND THREW IT AWAY*. He replaced it with a single speed 240V 3 phase motor and a VFD.
Now this kind of works except now you really have NFI just what speed your table feeds are doing as the rotary knob is lying to you. I hate it. It cost him $500 on the sale frankly which was interesting for him as he thought it should be worth more, being able to run off of a single phase supply and all. I differed and so apparently did everyone else.
So I'd power the feeds separately from the spindle if you can.
I still want to fit mine with the proper 2 speed motor but haven't found one yet.
PDW
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1st Oct 2020, 10:58 PM #17Member
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2nd Oct 2020, 10:27 AM #18Most Valued Member
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Wow, that looks pristine inside. #Winning
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2nd Oct 2020, 02:12 PM #19Member
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Big plan for this weekend is disassembling the axes.
I'm having trouble working out the y axis on top of the column though
P1144432 2.jpg
I've tried undoing the leadscrew nut at the back, and completely removing the gib strip (not shown in the pics)
The dovetail seems to be contained with a partial box way (which also protects the long drive gear), and the axis is still tight
P1144433.jpg
I can't really see anything holding it in place, I can't slide it forwards or back (the long drive gear hits the box way)
I might just try lifting straight up this weekend
P1144434 2.jpg
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2nd Oct 2020, 02:15 PM #20Member
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3rd Oct 2020, 12:13 AM #21Most Valued Member
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Not real familiar with that model - doesn't it have the joystick for X & Z movements under power? Mine does - no power feed on Y but the other axes are fine.
Ah - I now recall you writing something about missing feed bits so if that's the case, I understand your problem. This Old Tony had a recent series on CNC converting his Maho - I suspect a similar approach just using Arduinos to drive the steppers would be a quicker thing to do.
I have a few of those about the place myself and at least 5 Raspberry Pi's of various configs. Nice little computers for all sorts of tasks.
PDW
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3rd Oct 2020, 08:36 AM #22Senior Member
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Hi TMG,
I'm going through the process of grease removal from an FP1 so my comments pertain to that, but I think the GHA is somewhat similar.
On the Practical Machinist website there is a lot of good information under the Deckel heading, but to remove the Y drive system you will need to remove the horizontal spindle as the drive gear is limiting it. The gib strip should be removable by backing off the adjustment screw, if it wont move look for the Y axis locking handle, it could also be broken off. From my experience and different to some diagrams, the head will not lift off, it needs to be slid off.
The Y feed screw should be detachable from the bracket at the rear of the Y ram, the bracket IIRC has locating pins in it. Good luck, Alan.
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3rd Oct 2020, 07:19 PM #23Golden Member
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Hello TommyGM,
Reading this thread stirred a memory that I may have some info on the Alexander mill, and exploration of my files shows two pdf's, one 24 pages and the other 30.
If you are interested please PM me with your email address and I will send them (each file is about 6MB).
Cheers,
Bill
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4th Oct 2020, 07:50 PM #24Member
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15th Oct 2020, 12:54 PM #25Member
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I managed to get the y axis off and the long travelling gear looks great! The gearbox oil looked pretty clean, but I changed it anyway
The underside of the y axis also looks good. The lightning bolt oil grooves were sharp (almost serrated) edged which I didn't like. I took a needle file to these and then stoned those edges down to remove burrs
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26th Nov 2020, 11:10 PM #26Member
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Getting back to this mill project. I cleaned up the table with scotch bright
Only needed to go over it lightly and it came up awesome
vlcsnap-2020-11-22-20h50m11s823 2.jpg
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27th Nov 2020, 07:46 AM #27Senior Member
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Nice work mate.
I cry everyday because I missed out on this one when it came up for sale
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27th Nov 2020, 08:13 PM #28Member
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29th Nov 2020, 07:01 PM #29Member
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The mill came with a slotting head, I gave it a bit of attention over the weekend
It was completely seized up, but now runs silky smooth
Other than surface rust and some lubricant (grease?) that had gone nasty in the slide, everything was in decent shape
P1144429.jpgvlcsnap-2020-11-29-18h38m28s011.png
However, the rear locating dovetail was severely cracked (I think the previous owner tried to lift the entire mill using the hole in the back??). There wasn't much point in milling it off as it was barely on, so a few light hammer taps knocked it off
P1144431 2.jpgvlcsnap-2020-11-29-18h57m22s729.png
Just using the front dovetail appears to align it quite well on the machine, and being the rear dovetail, technically it shouldn't need to resist any tension or sideways forces when slotting vertically.
I need to address it, but there is not much material to work with short of welding. For now I'm leaving it until I come up with something
Progress...
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15th Dec 2020, 10:44 PM #30Member
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Well got back to this project and removed the x axis which was very stiff.
Removal was fairly straightforward, remove both handwheels, remove the right cover plate, undo the screws and slide out the gib, then temporarily refit the right handwheel and wind the leadscrew out. An engine crane was used to support the heave block of iron at the end
Annotation 2020-12-15 222939.jpg
The ways are dirty from old oil (maybe grease?) and a little rust, but not to bad.
Annotation 2020-12-15 223046.jpg
aaand this is where we get the first sign of wear on this project. HEAVY scoring on the ways and gib strip.
This is in multiple locations. I used an Arkansas stone to remove the severe burrs, and the followed with a precision ground flat stone. We'll just call them oil retention grooves
Annotation 2020-12-15 223111.jpg
Otherwise everything cleaned up reasonably well (I did a bit more after this photo was taken)
Annotation 2020-12-15 223929.jpg
It should slide much better now, but I'm taking the z axis off first, so I won't get a chance to test how smooth it is for a bit.
The scoring makes sense if you look at how the axis is arranged, the ways are unprotected at the sides, and it is very easy for contaminants to enter. I'm not sure if there is normally a cover, I'm certainly going to make something after seeing this.
More soon
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