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Cowells Milling/ Z axis design

Cowells Milling/ Z axis design

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Steve Wan 114/05/2022 17:20:41
17 forum posts
4 photos

Hi Folks

Greetings to all

I'm building a small table top mill with some thoughts from Cowells mill. I like the z axis feed screw vertically with a top handle rather the conventional position at the base with bevel gears. My mill has little room below the mill table. Hence, Cowells design is best to apply.

Wonder anyone here can share photos of the assembly drawing or explain type of bushing and attachment design to the mill body and the table?

Much appreciates ahead.

Steve Wan

cowellsmill.jpg

bernard towers14/05/2022 17:42:23
617 forum posts
109 photos

Its the same design on my shoreline maybe a look at their site might. There is also Taig or Peatol

Michael Gilligan14/05/2022 22:12:36
avatar
20182 forum posts
1053 photos

There are some useful-looking images here: **LINK**

http://www.lathes.co.uk/cowells-miller/

MichaelG.

Steve Wan 115/05/2022 16:41:32
17 forum posts
4 photos

Hi Bernard, could you share some light over the assembly of the z axis of your Shoreline? Much appreciated here.

Steve Wan 115/05/2022 16:43:58
17 forum posts
4 photos

Hi Michael, thanks for the link to Tony's www.lathes.co.uk. But I need to know parts here to join altogether.

bernard towers15/05/2022 21:35:40
617 forum posts
109 photos

Suggest you trawl the sherline website

Michael Gilligan15/05/2022 23:10:51
avatar
20182 forum posts
1053 photos
Posted by Steve Wan 1 on 15/05/2022 16:43:58:

… But I need to know parts here to join altogether.

.

I’m afraid you’ve lost me, Steve … this photo seems to illustrate it all rather well:

.

68298c9d-0354-468c-b9a2-1af3e827ee1e.jpeg

[Credit : http://www.lathes.co.uk/cowells-miller/ ]

Unless you actually want full drawings of the Cowells components, I would have thought there was plenty of information there ^^^ to show the design principle.

MichaelG.

.

P.S. __ from the Cowells brochure:

Vertical Travel - 164mm - 6.5”  

Feedscrew Pitches - 1mm

Edited By Michael Gilligan on 15/05/2022 23:18:30

Michael Gilligan15/05/2022 23:58:20
avatar
20182 forum posts
1053 photos

Another useful detail photo: **LINK**

http://www.cowells.com/Gallery/Vm16.jpg

MichaelG.

Steve Wan 116/05/2022 13:56:24
17 forum posts
4 photos

Hi Michael

Thanks, all the parts here are crystal clear just that I'm figuring out where's the best place to put the compression bearings? Below the hand wheel or the plate joining the pillar?

Of course if anyone would scan me the assembly drawing would the great!

BTW Bernard I have mistaken your word for Shoreline with Sherline I have both Sherline mill and lathe for years, Yes, I could copy the design.

Steve W.

Baz16/05/2022 16:51:17
724 forum posts
2 photos

What are compression bearings? I will take a wild guess that you mean thrust race, and that would go under the assembly that rotates.

Steve Wan 117/05/2022 06:19:32
17 forum posts
4 photos

Hi Baz, Yes thrust bearing. Any thoughts where's the best place to put?

Below the handwheel or nearer the feed screws? You own a Cowells Mill?

Steve W.

John Haine17/05/2022 08:45:05
4673 forum posts
273 photos

Steve, the clue is in the name, thrust bearing. What direction do the forces act when you operate the screw?

Michael Gilligan17/05/2022 09:09:14
avatar
20182 forum posts
1053 photos

Have a look at this, Steve : **LINK**

https://www.arceurotrade.co.uk/projects/MYF001/myford-cstb-mod.html

Now … use your imagination, and visualise it operating in the Z-axis

That would surely be a good basis for your design.

Note: I have never seen the actual Cowells unit dismantled.

MichaelG.

Phil H118/05/2022 19:55:35
459 forum posts
60 photos

Is a ball race strictly necessary? I would have thought that a plain, bronze washer would have been adequate?

Phil H

Steve Wan 119/05/2022 02:50:38
17 forum posts
4 photos

Hi John, Michael and Phil, thanks for the feedbacks

Yes, I think the best spot for thrust bearing is next to the handle where the turning load is at most. Yes, also a bronze washer can be used. Infact, one of my washer is a thick PVC and has been in use for years.

Steve W.

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