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To stiffen the Z axis.

PostPosted: Mon May 16, 2016 2:43 pm
by FixitMike
I've noticed that the Z carriage on my Shark Pro Plus deflects significantly when I plunge. I finally figured out some of the reason why. The back plate of the carriage is fastened to the plates that carry the ball slide bearings with two bolts that are located close to the center of the back plate. Not a particularly rigid connection. So I added some extra screws to stiffen the connection per the attached photo. It does make a difference.

Re: To stiffen the Z axis.

PostPosted: Fri Feb 17, 2017 10:46 am
by anglinnr
I have been fighting this problem for the past 2 years. I was getting ready to rebuild the entire carriage out of aluminum. You may have just saved me a great deal of work. I have also noticed that there is flex in the x axis rails. The top one in particular. I plan on putting an aluminum angle across the back side at that point.

Re: To stiffen the Z axis.

PostPosted: Thu Jan 04, 2018 6:57 pm
by FixitMike
The X and Y axis rails in the ProPlus are marginal. I calculated that the weight of the gantry, Z carriage, and router will cause a deflection of .027" in the center of the table. The result is that if you put a dial indicator in your chuck, a perfectly flat table will look like it is .027" high in the center (because the router drops that much). This thread has a log of good information about making the axes more rigid: viewtopic.php?f=9&t=1342

Re: To stiffen the Z axis.

PostPosted: Thu Jan 04, 2018 7:30 pm
by BillK
yes, I got 0.0285" when I calculated the deflection many moons ago. viewtopic.php?f=9&t=670&start=10

This has not affected anything that I have ever machined, but I remain aware of the center spot and do most of my small work in the lower let hand corner.

Re: To stiffen the Z axis.

PostPosted: Fri Jan 05, 2018 12:52 am
by tonydude
Take a look at this video on youtube https://www.youtube.com/watch?v=TSTThLM8s8o&t=430s how he has strenghten his shark.

Tony