Need help with Tramming my Grizzly G0759

[almega]

I have a G0759 from Grizzly which is the same machine as the G0704 and some other brands of the same basic machine. I cannot figure out how to adjust the head in the Y-axis to run true to the table. I can adjust in the X, which I have done to within .001" over 11", which for me is pretty good. As it currently sits, across the full width of the table, 7" front to back, it is out .0045". I checked manual and it is silent on this, so I thought I would see if the accummulated experience of this group could help me out. I will look forward to some good suggestions.

 

[Cogsy]

My mill is different to yours but also does not have adjustment in the Y plane. What you likely have to do is shim the column to base attachment point. It's a pain to do, and get right, but once it's done you can pretty much forget about it as it shouldn't change much. Looking at pictures of the G0704 online, it looks like you would need to shim either the top 2 mounting bolts, or the bottom 2, depending on which way you need to go. For my machine I ended up using slices of aluminium can as shims and got it to within 0.01mm across the full travel.

 

[RM-MN]

I saw a video where a person had that problem and used aluminum foil as shim material. Later they took the column off the base and smoothed out the machining marks and didn't need the shims anymore. You might be that lucky.

 

[almega]

Thanks for the responses. I did see on line that shimming was an option but I guess I was hoping for some other adjustment. No worries, I will begin shimming and see how close I can get.

 

[Wizard69]

Thanks for the responses. I did see on line that shimming was an option but I guess I was hoping for some other adjustment. No worries, I will begin shimming and see how close I can get.

This is normally handled in machine rebuilds by scraping the column and base into alignment. Another possibility is epoxy grouting. You can shim of course but that can lead to distortions in the base/column interface.

Epoxy grouting is actually used in commercial machinery builds but it is something that should be designed into the machine. On these small mills you would need a way to adjust the tilt of the column, often jack screws and a way to inject the epoxy grout into the gap.

 

[almega]

This is normally handled in machine rebuilds by scraping the column and base into alignment. Another possibility is epoxy grouting. You can shim of course but that can lead to distortions in the base/column interface.

Epoxy grouting is actually used in commercial machinery builds but it is something that should be designed into the machine. On these small mills you would need a way to adjust the tilt of the column, often jack screws and a way to inject the epoxy grout into the gap.

For purposes of a small mill like mine, what if I were to install shims until the column is true and then apply epoxy grouting around the shims to give a uniform bearing surface for the base of the column after the epoxy sets leaving the shims in place?

 

[bazmak]

I killed 2 birds mwith 1 stone with my sieg mill.I added 2 additional plates to give me more vertical room
and enlarge the footprint to incorporate riser screws and avoid shimming.Takes a while to get it right
but have never had to readjust

 

[almega]

Very effective solution if the column mounts with a foot like yours. Unfortunately the G0759 mounts through the rear into the base of the machine. I suppose it might be possible to add jacking screws to the side flanges but could cause more problems than solving.

 

[almega]

Finally!! I got the tramming completed as best I could. I hope I don't have to do that very often. Along the x-axis I was able to get it to .0008" over 12" and along the y-axis I could only get it to .0009" over the full depth of the table surface, but that should be good enough for my purposes. I ended up using shims to "tip" the column and true it to the table. Not particularly hard but time consuming and tedious. I had to walk away from it a couple times to get "unfrustrated". Once I had the table all trued, I had to true up my vise just a bit with some .004 shims on one side. Now I think I am ready to start working on making the parts for an engine.

 

[Wizard69]

A little late but I’m glad to see you have things to your liking. Squaring up a machine can be very tedious work.

In my younger days I work as a mechanics helper in a machine tool rebuilding operation. Everything was aligned by hand scrapping surfaces in, extremely tedious work. It could also be back breaking when some of the components required cranes to move around. I must say the guy I worked with was a genious when it came to machine tools. To this day I wish that I could have soaked up more of his knowledge.

 

[TimTaylor]

Good job Almega!

I used stainless shims to square the column of my G0704 to the bed as well. It can be time consuming, although I cheated a little ........I have access to an electronic digital level that will accurately measure absolute and relative angles and squareness to 0.001 deg.....

Tim