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Messages - jrslick22

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131
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 09, 2010, 04:43:12 AM »
Another view from the other side.


132
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 09, 2010, 04:39:09 AM »
I don't suppose anyone is interested in buying 3/4 of an AL54b? seems like a real shame to pay good money for a lathe that you just end up reducing to its bones and binning.

133
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 09, 2010, 04:37:40 AM »
Ive got the left side and internal wall done, looks great don't it! says the proud father.



As you may have guessed from the saddle i had this done before I started screwing with the x axis ball screw.

You may notice i have the entire top cabinet attached underneath the coolant trey, I'm not sure why i did this, i think it may just have been easer to attach this way, I'm going to pull it all off tomorrow and have ago at attaching it to the top of the coolant trey instead. this will make it a lot more coolant tight i will however have to re cut the internal wall as all the mounting points would be thrown out by the 25mm lift.
Im not sure why but people seem to mount the Z axis motor on the back end of the lathe, to me the logical place to put it is where the gearbox is, its out of the way close to alot of other wiring and you dont end up with a nob sticking off the lathe, i guess what im saying is that the gear box will come off tomorrow.

134
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 09, 2010, 04:17:51 AM »

A pair of angular contacts at one end are the norm nowadays and if the ballscrew is supported at the other end its  just a normal ball bearing that is used. One of my mills has a pair of taper rollers instead of angular contacts but they have been shimmed to provide the preload.

Hood

For anyone following this thread:

135
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 09, 2010, 04:13:42 AM »
It should work fine, my lathe has a similar kind of set up, see pic. One thing I found on mine was in the chip pan there was the strainer was made of punched sheet with about 8mm square holes and the coolant tank underneath would get chips in it. I fitted some finer stainless mesh over it and its fine now.

Ive made sort of a basket to keep the bulk of the chips out within (behind in the pic) is a 50x 40mm bit of scotch bright this catches the bulk of the fine stuff. also within the tank there is a settling area for any solids that should make it that far.

136
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 08, 2010, 11:47:45 PM »
Ok guys need a little help now, the ball screws for both axis are on back order (same as the one i have just sorter) I want to ket started on the bearing block should i use thrust ball bearings or standard bearings?

I have in the past used thrust ball bearings with reasonable success, i am however open to ideas?

thanks

137
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 08, 2010, 11:01:36 PM »
The coolant tank which i painted a few days ago has hardened up nicely so this morning i bolted up the pump, plumbing and wiring and gave it a test for leaks. I have to do a few minor tweaks but overall she worked great.



Back to the X Axis after the tank was sorted, I decided that the previously mentioned plan was worth a crack so i headed off to my mates place and ground the third side of the nut, i popped a hole through the slide and with a few alterations to the saddle i think its might just work.




138
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 08, 2010, 10:52:10 PM »
Thanks Dave, i have never seen this on a machine before (hope thats not a bad sign?) I just dreamed it up during the initial sketch up. about the olny bad thing i can say thus far is that when you put tools etc on the try the eventually fall into the bin, this wont be a problem once shes up an running as i wont have pile o crap on the trey.

139
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 08, 2010, 06:02:57 PM »
I got sick and tired of tripping over everything  and had a clean up, as part of my clean up I cleared a space and made a home for my lathe.
I have added the right hand side panel and the back, its starting to look like a nice machine now.



You can see that I have also bolted up the new tool post, in previous post I mentioned that it was under powered I have found the reason for this. My inverter only puts out 200 odd volts instead of the standard 415v, thinking I had brought the wrong inverter i madly ran of to a local industrial motor shop and asked them about it, they explained the difference between the star and delta configuration, 20min later i was cutting 2mm passes and grinning from ear to ear.

140
Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand
« on: November 08, 2010, 04:08:22 AM »
I'm far from a machinist but i have more enthusiasm than I know what to do with so had a go at milling a pocket for the nut ad well as the socket I'm going to have to fit the the end of the ball screw. I wouldn't know where to begin to get bobcad to produce the code for the 3D pocket so it just sort of made it up as a went, it is the approximate size of the nut, the only measurement that i made sure was spot in was the width of the nut flange and boy is it tight on the nut. My plan is to hammer the nut in there then some how bot it so that it cant rotate, with no movement from side to side and no way to rotate i should have a zero backlash X axis - well heres hoping!
My fist time using a ball nosed cutter and i quite enjoyed it, to be honest the only reason it was easy was due to my new Gwizard subscription, set the feed rate and the spindle speed and away you go.

The hole in the middle is the original nut mount.



So after cutting as deep as i dare and taking some more measurements I am going to have to grind this nut something silly. Sorry the  pic is bad it was moving in the machine.
You'll notice the M6 cap screw in the side this is a grease nipple hole, I figured that if im going to grind the flange off I had better give myself as much chance of seating it as i can by retaining as many of the bolt holes as i can by grinding it on an angle i was able to retain 4 of the six holes instead of keeping 2. I'm starting to also think that i may be able to utilize this grease hole as well by drilling through the slide and attaching some sort of screw to this hole to assist with preventing rotation. The reason i say some sort of screw is that I had to mill so much out of the slide to give the nut clearance that i only have about 1.5mm between the peak of the nut and the top of the slide, the goal is not to clamp it using this screw but to prevent rotation of the nut so maybe all use a grub screw, even better would be a flat grease nipple - ill come up with something.


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