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Home Workshop > Projects Area > Millers > Elliott Junior OmniMil Mod

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Elliott Junior OmniMil Mod

Elliott Junior OmniMil Mod

Hi fellow OmniMil users,

I purchased my machine about 25 years ago and have never been totally happy with the rigidity of the vertical head as it left a poor finish.
After a short amount of thought I realised - why not use the horizontal arbor support?
I looked at the back of the flange on the top horizontal support and the vertical head is fixed with three bolts. I thought: I could use the two lower bolts and drill and tap the end of the horizontal arbor support.

https://i.imgur.com/wDqvi7m.jpg

I drew the dimensions of the three centres on cardboard as a template to make sure the hole centres were correct, with a dish to clear the top horizontal beam.
Once I was happy with the template I transferred it to 3/8" plate (because thats what I had at the time).

https://i.imgur.com/hkitgNg.jpg

Then I tapped the end of the horizontal support with 1/2" UNF and made a 1/2" UNF bolt with a 3/4" head (to match the original bolts on the machine) and fitted 3/8" longer bolts for the two lower bolts on the upper horizontal beam.

https://i.imgur.com/JGUxLlO.jpg

As this mod was designed to improve the rigidity when vertical, it can only be used when straight ahead and vertical. Simply removing the lower bolt allows for the top arm to swing as before and rest of the mod can be left in situ.

https://i.imgur.com/M0QbDBm.jpg

The central hole is purely decorative and serves no practical purpose.
This was implemented about 6 months ago, and has proven to be quite successful. The feeling is much more smooth, and leaves a better finish.

Thanks for reading, and I hope to hear your feedback!

Merry Christmas to all and have a productive new year!

Edited By: burrell35
Dec-24-17 12:58:30

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Richard Millard
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Re: Elliott Junior OmniMil Mod

Brilliant. I’m thinking about doing the same, thanks for sharing. Thinking about this with a bit of ingenuity you could add a screw adjuster to enable easier adjustment of the vertical head, I find it very difficult to get to exactly it vertical (Tramming) . I'm having a think so will psot solution if I get round to it!
Ashley

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Ashley Slater
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Re: Elliott Junior OmniMil Mod

There is a Yahoo Group focusing on Elliott:  https://groups.yahoo.com/neo/groups/Ell … wners/info
The group could do with a boost and your images and modification would be a great addition.

I have a later Omnimill myself, yours looks like it has the 3MT on the horizontal as well as vertical.
Just about to go and start a DRO fitment on mine, quite daunted by this and keep putting it off

Philip

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Re: Elliott Junior OmniMil Mod

Phillip. I am considering a dro too which make did you go for?
Ashley

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Re: Elliott Junior OmniMil Mod

Hi Ashley,
                 My set up wasn't a kit, I have a glass scale that is going to be used for the  Z and I am in the process of fitting Machine DRO Magnetic encoders on the X and Y.
For obvious reasons the X is going on the back of the Table and Z on the column the Y is trickier and I am still working on that

Philip

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Re: Elliott Junior OmniMil Mod

Philip. Thanks I have looked hard at my mill and it does look a bit tricky to add a scale to the Y axis , but I am worried about loosing travel if I put the X axis scale behind the table but I agree it's the obvious place. Probably need to add a stop to prevent trapping it too.  I am really tempted by the Chinese stuff on  Ebay  but am going to the Model Engineering Exhibition later this month so I'll see what's on offer  there. Machine DRO seem to have a comprehensive selection. I am proceeding with a similar modification to Richard but in two parts a collar for the overarm support and a bracket from the head allowing me to add two adjusting screws so I can tram the head vertical, at the moment I use a soft faced hammer to adjust the vertical there must be a better method.  I'll post some pics when I get it sorted.
Ashley

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