Author Topic: Boley 4L  (Read 22986 times)

Offline RotarySMP

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Re: Boley 4L
« Reply #50 on: April 11, 2016, 04:26:39 PM »
Reassembled the spindle this weekend. It went smoothly, except I messed up on the back gear and had to pull it out and start again.

Once it was all back together I ran it for about an houe without any load, increaseing the speed along the way. Finally put the whole machine back together. I haven't finished scraping the topslide, as I still need to do the tapered surfaces, and clean up the top.

Mark


Offline RotarySMP

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Re: Boley 4L
« Reply #51 on: April 11, 2016, 04:31:08 PM »
In the sales Brochure for the 4LV, I read that the level tailstock has the Boley 358E collet nose. Never notice that before, I thought it was #2 Morse.

Looks like previous owners of this lathe, didn't have access to a tool for turning a tommy bar down to the correct diameter to fit the collet draw tube  :doh:

Mark


Offline JHovel

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Re: Boley 4L
« Reply #52 on: April 13, 2016, 11:05:44 AM »
Just found this thread.
What a beautiful lathe! Great restoration work!
There are a couple of things that puzzle me:
I don't understand how the chuck works or how it is operated. Can you explain that to me please? It looks like it would be 'swarf proof' - am I right?
Secondly, I can work out how the tailstock works. It seems to have both lever and screw operation at the same time.... how is that done? Can you perhpas sketch the construction or show me a drawing?\
Both very interesting!
i have "built up" my lathe from an old special build (no maker's name) double ended connecting rod boring machine, using a Southbend tailstock and I would like to modify that to have more travel and maybe a handwheel (not lever), but I don't really want to loose option of the fine and forceful handwheel movement if required....
Thanks for showing us your work!
Alles Gute.
Joe
Cheers,
Joe

Offline RotarySMP

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Re: Boley 4L
« Reply #53 on: April 13, 2016, 04:04:40 PM »
Hi Joe,

The chuck is just a regular 110mm Klopfer, with a backing plate to mate with the spindle screw thread.

Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #54 on: April 13, 2016, 04:11:12 PM »
Hi Joe, Sorry it is not a fancy mechanism. It is two separate tailstocks. The lever operated one has a collet nose, and collet drawbar. The regular tailstock has a #2 Morse nose, and also has provision for set over.

Please start a thread and post pictures of your lathe. It sound like an interesting one.

Mark


Offline RotarySMP

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Re: Boley 4L
« Reply #55 on: April 13, 2016, 04:15:24 PM »
Along with the lever operated tailstock, and the lathe spindle, I also picked up an old shop made indexer which uses the same 358E W23 A12 collets. Very handy for making simple things like bolts with a hex or square to be milled. It can index 6, or 8 holes.

Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #56 on: April 13, 2016, 04:18:18 PM »
Yesterday I turned up a plug for scrap cast iron, threaded it to M12, and JB welded it into the hole someone had bored in the compound (probably for a Multifix QCTP). Let it harden over noght, and tonight I roughly milled it flat. Once I shape/grind or scrape the top flat, and get all the dings out, I hope it won't be too visible.
Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #57 on: April 18, 2016, 02:38:57 AM »
Yesterday I was out at a friends place, and we cleaned up the compound on his Klopp shaper.
https://www.youtube.com/watch?v=D80O-UI3kpw&feature=youtu.be

Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #58 on: April 27, 2016, 04:59:18 PM »
I have three chucks, but only one back plate. My order of Meehanite arrived today. The plan is to make:

A 70mm back plate for the Bison 125mm Four jaw.
Another 110mm back plate for the second 110mm three jaw.
A 110mm catch plate to drive the dog when turn between centers
A spindle thread protector for when I am using collets.

Once the new furnace is finished, I also want to cast my face plate.
http://www.alloyavenue.com/vb/showthread.php?10501-Build-thread-Calcium-silicate-insulated-copy-of-Myfordboy-J-Vibert-furnace&p=188218#post188218

Before I can turn the female threads, I'll make a gauge. I turned up the three 2.38mm gauges required to measure the thread, and glued them to some wire to hold them in place.

Also got the blank for the gauge ready.

Mark


Offline RotarySMP

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Re: Boley 4L
« Reply #59 on: April 29, 2016, 05:27:22 PM »
Turns out that drawing I posted of the spindle nose is incorrect. It shows 41.54mm over 2.38mm thread wires. I made 2.42mm thread wires, and my spindle is only measures 40.90mm with them. Martin from the CNCecke also confirmed that drawing is incorrect with thread wire on his spindle as well.

Today I cut the thread in the spindle guage. First ground up a 55 bit with 5 of top rake on the Clarkson. Set the top slide to 27.5 and zeroed it, scratched off on the work with the cross slide and zeroed it as well. From then on all cuts were make with the top slide.

I turned with the slowest back gear. 73RPM.

I made quite a few mistakes, so I'll have to make another one, but at least it shows the Boley can cut it's own spindle thread in Meehanite.

The mistakes:
- I had the alignment boss spot on size, within a 0.0001" of the spindle's boss, and nicely polished with 600 grit sand paper. Thought I could improve the finish with 1000 and 2000 and went 0.0003" under. The alignment boss is 41mm h5 which only gives a tolerance of 0.0003" (11 micron). I need to get some metric micrometers. My 1-2" Starett also can't be trusted for absolute values, as zeroed on a 1" standard it's 0.0003" out on the 2" standard (or one of my standards is out). Still, it works fine for comparison measurements like this.

- Setting up, I slipped on the keyboard and did a G0 Z-41 instead of G0 Z-1, and put a thread into the alignment boss.

- In the middle I got impatient and tried a couple of cuts at 140rpm. I suspect that LinuxCNC accelerates at max rate for the axis when starting a G33 thread move, and then once at speed maintains sync. Speed variation during the threading are compensated for, but speed variation during acceleration aren't. Since the rotation angle travelled doubles during that acceleration with double the spindle speed, the thread then has a slightly different track. Need to pick a speed and stick to it for the whole thread.

- I started off doing 0.2mm infeed on the compound each cut. At about 0.8mm in, I had brain fade and infeed to 1.4 mm or so. Stalled out with a slipping spindle belt. Luckily it was early enough in the cut that most of the scars were cut out later.

- I dropped to 0.1mm infeed per cut at about 1mm, and to 0.05mm per cut at 2mm. Got impatient and tried 0.2mm when already at 2.2mm. Stalled again, but less harm down. Luckily did not lose sync, as LinuxCNC synced the Z stepper down to a stop following the spindle.
- Didn't stop to measure often enough. Went to 3.30mm infeed.  I cut the thread about 0.15mm too deep.

This one is a bit too small to be useful as a guage. A back plate cut to have a nice fit to this is probably still too tight for the real spindle.

Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #60 on: May 13, 2016, 04:43:25 PM »
I made the first chuck adaptor, this one for the 125mm Bison four jaw.

Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #61 on: May 23, 2016, 07:59:00 AM »
Made two more, one for the second three jaw, and a spare which I might use as a catch plate.

Mark


Offline RotarySMP

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Re: Boley 4L
« Reply #62 on: November 04, 2017, 07:04:53 AM »
Ade's thread got me lusting for a camlock spindle again.
http://madmodder.net/index.php/topic,12328.0.html

Last time I thought about making a D1-3 adapter for the Boley's threaded spindle nose, I thought I worked out that there is not enough meat in the D1-3 to fit over the threads.

Just to make sure, I modelled it this time. Buggar, I was right. Since the cams only turn less than 180 from unlocked to locked, I guess I could still get in there and relieve the end of the CAMs leaving the retention lip only in the arc where it is actually needed.

Then again, once we start getting unrealistic, there is also the Hembrug on Richardo.ch for 950 buy it now...
Mark

Offline RotarySMP

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Re: Boley 4L
« Reply #63 on: November 09, 2017, 12:29:07 PM »
I was curious how much lower my tailstock is than center height. I turned up a brass slug to within 0.005mm of the 27.98mm tailstock ram diameter, and put a clock on it.

It is about 0.18mm (~7 thou) low when retracted, and quite level at about 0.03mm different along the length when fully extended when loose. It raises up 0.02mm when the ram lock is applied. Given the wear on the bed, this is not as bad as I feared. Sooner or later I'll have to have a shot at scrapping the bed.

It is still a nice old german machine. I was a single 1/100 over my finish cut to size that slug of brass, and at least on this lovely free cutting metal with a sharp HSS tool, taking another  cut of 0.005mm on radius over a short distance cut cleanly, and left a perfect surface finish.
Mark
« Last Edit: November 15, 2017, 04:34:00 AM by RotarySMP »

Offline RotarySMP

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Re: Boley 4L
« Reply #64 on: November 15, 2017, 08:12:46 AM »
I was showing my Boley fine feed adapter to a mate who also has a Boley 4L, and was embarassed how grimy it was. Time I gave it a thorough cleaning. It is in excellent condition, with no significant wear or damage.
Mark