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Member postings for Lex Davis

Here is a list of all the postings Lex Davis has made in our forums. Click on a thread name to jump to the thread.

Thread: All things Beaver Mill
15/11/2020 07:21:38

The oils specified in the 1970"s operation manual are no longer available, although alternative oils of equivalent specification are. I just use ISO68 hydraulic oil as most of it leaks out anyway. Any oil of roughly the correct viscosity is probably better than running it dry.

10/09/2020 13:48:52

A handy addition to the Beaver that I have been working on for the last few days. I think it looks a bit "agricultural" but it is very useful and easily removed if required.

img_2409 (2).jpg

08/09/2020 02:36:50

Before I start making a new dial, as one of mine is missing,though I would ask the question here first - what are my chances of finding one of these anywhere around the world? I need the 0- .200" dial for the x axis.

beaver dial.jpg

04/09/2020 12:55:56

Thanks for the information DC, I completely missed the spring in the parts manual but it definitely is in the down feed handle gear as you and Mark suggested.

04/09/2020 04:36:26

It's not a simple matter of rotating the pinion a bit because that will move the position of the dowel pin that acts as the Zero position stop. There must be some way to apply more tension directly to the spring but I think that the spring is either in the Quill casting or the feed gearbox housing on the left, it is not on the handle side of the head.

Edited By Lex Davis on 04/09/2020 04:37:46

03/09/2020 03:07:22

Does anyone with a Mk2 know where the return spring for the quill is located, the parts manual does not show it.

I need to get a bit more tension on mine somehow but I don't want to start pulling things apart until I know how the spring is set up.

27/08/2020 02:33:38

This photo shows the #40 spindle bore and face after grinding, run out on bore and face is now less than .0001" (.0025mm). The picture does not show up very well but the finish produced by the TPG is very good.

spindle bore and face. (2).jpg

21/08/2020 07:38:48

I didn't take much notice when I took the Quill assembly out Mark, but I did notice that there were burrs on the driven side of the splndle spline which I had to stone off. I have almost finished regrinding the spindle taper now so I will check the fit of the splines when I put it back together soon.

Lex.

20/08/2020 07:21:34

Any photos Mark, I think I will need to make a new splined bush as well.

18/08/2020 10:05:53

The spindle is back together and feels quite good, I have it set up on my lathe ready to regrind the #40 taper with a Toolpost Grinder.

beaver spindle (2).jpg

25/06/2020 09:19:33

This is the Bearing Preload Fixture that I made to simulate fitting the bearings and spacers into the Quill/Spindle assembly. It allowed me to quickly determine the difference in spacer height required. I found that a small change in spacer height (3 microns) makes a big difference to the torque needed to rotate the bearing assembly.

bearing preload fixture 1 (2).jpg

bearing preload fixture 2 (2).jpg

23/06/2020 13:37:46

I now have a small amount of preload on the bearings with the inner spacer now measuring .0031" (80 microns) less than the outer spacer. I don't think that these bearings were a matched set of Duplex bearings with the correct amount of offset ground into the faces.

14/06/2020 13:11:16

Hi Brian, the Bull Gear etc will be the next area that I delve into, I wonder what I will find in there. My machine is a Mk2 so I don"t have any info on the Mk1.

I have now realized that the bearings were set up in the DF configuration but from the information in various bearing books I have decided to set them up as DB and after grinding the spacers in small stages I am now at a point where the 2 spacers are nearly identical in height and preload is nearly correct which brings me to believe that this is the way they were intended to be fitted.

 

Regards,Lex.

 

hoffman brg. (2).jpg

 

Edited By Lex Davis on 14/06/2020 13:38:09

13/06/2020 01:14:11

I have finally had a chance to remove the bearings from my spindle and I am not impressed with what I found. Someone has obviously been in there before and really made a mess of it. The outer bearing spacer has been surface ground to about .005" less than the inner spacer and both spacer are out of parallel by at least .001".

There were also burrs and dings everywhere, not to mention that the two top locknuts were loose.

There are no actual seals on this spindle just a type Labyrinth setup at each end.

beaver spindle (2).jpg

17/04/2020 10:16:53

I can't help with that one Brian.

Regards, Lex.

27/02/2020 23:37:10

You are correct Mark,the N9126 bearings were a special size made specifically for the Beaver milling machine.

It's a pity that the Beaver manuals did not keep up with the changes made to the various models over the years, the manual that I have does not show these bearings at all and other parts are completely different to what is shown in the manual.

26/02/2020 07:56:04

I finally got around to removing the Quill/Spindle assembly from my Mk2 #40 taper machine. It really is a simple , straight forward procedure if you follow the instructions.

I was surprised to find that the 2 locknuts (items 52 & 53) on the top of the spindle were completely loose and had allowed the spindle to drop down a couple of millimeters.

After removing the Spindle Bearing Nut (item 62) I carefully tapped the spindle, complete with bearings and spacers etc, out of the Quill to have a look at the bearings. The lower bearings are Hoffman N9126 with dimensions of 40 x 72 x 17mm. These are no longer available so I will have to clean them out and re lubricate then see how they perform.

24/10/2019 08:31:25

I'd like to help with some useful information Mark but I have not disassembled my quill yet so I don't know exactly how it is built.

08/10/2019 12:11:30

Such a simple procedure, I thought there would be more to it.

Edited By Lex Davis on 08/10/2019 12:14:06

07/10/2019 05:04:56

Thanks Peter, do I need to do anything at the pulley end of the Quill/Spindle assembly?

It may be a while before I get around to removing the spindle but I will definitely get some dimensions of the felt seal.

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