Grizzly G0619 Column Stiffening

The amount of rigidity you will achieve is limited by the slot that must remain open for the screw. Making a full connection with reinforcement from the top of the column, then along the sides and connecting to the base is close to as good as it gets.
 
RODSME: Your comment made me go look up the Youngs Modulus of epoxy granite and lets just say homemade epoxy granite and your right on. While it does have vibration dampening and weight going for it its not as good as steel for stiffness. Ill have to keep thinking about this. There is a person with a cnc conversion that mounted the screw to the outside of the column but this was on a cnc conversion. There should be a video on youtube about his machine to show how it was done. It was another guy playing with epoxy granite and he filled the entire column with it so that was the reason.

Thanks for posting your mod as well. Its great to see what people come up with to improve these machines.
 
Random idea. Has anyone ever tried bolting a heavy frame onto the back of the column and the mounting it directly to the wall? Something that looked like a vertical bridge with 2 beams and support triangles between them. This would keep the top of the column from being unsupported It would be ugly but perhaps solve the rigidity issue. Even a cable anchor would help keep the column from flexing forward.IMG_5302.JPG
 
In my March 29th post, I mentioned that the FEA torsional stiffness of the column was twice the value I got when I measured the mill after modifying it. I attributed that to the fact that the two side plates were bolted to the inside of the column and not one piece as in the model. I mentioned that I would consider epoxying the bars to the inside of the column if I had to access the area in the future. Well, the future is here. I epoxied the bars and increased the size of the pins attaching the back plate. The results were impressive. The column is now 4 times stiffer in torsion then the original modification. I was curious about the stiffness of the head stock in the X direction and so I performed a similar measurement to see what the stiffness is. Low and behold, the head stock is now more flexible than the column. I have been away for awhile and as such haven't tried the mill with the mods. I'll post my thoughts on how much, if any the mill has been improved when I actually use it.

I've attached a .pdf of the updated report I wrote. The update discusses the recent mods.
 

Attachments

  • Grizzly G0619 Column Stiffening Project.pdf
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In my March 29th post, I mentioned that the FEA torsional stiffness of the column was twice the value I got when I measured the mill after modifying it. I attributed that to the fact that the two side plates were bolted to the inside of the column and not one piece as in the model. I mentioned that I would consider epoxying the bars to the inside of the column if I had to access the area in the future. Well, the future is here. I epoxied the bars and increased the size of the pins attaching the back plate. The results were impressive. The column is now 4 times stiffer in torsion then the original modification. I was curious about the stiffness of the head stock in the X direction and so I performed a similar measurement to see what the stiffness is. Low and behold, the head stock is now more flexible than the column. I have been away for awhile and as such haven't tried the mill with the mods. I'll post my thoughts on how much, if any the mill has been improved when I actually use it.

I've attached a .pdf of the updated report I wrote. The update discusses the recent mods.
Are there any pics you can post of how you achieved this? For some reason I am unable to view the attachment. Will have to try later on a different device.
 
Are there any pics you can post of how you achieved this? For some reason I am unable to view the attachment. Will have to try later on a different device.
If you are unable to open the attachment, I can e-mail you a copy. Reply to this post.
 
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