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Re: To stiffen the Z axis.

Posted: 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.

Posted: 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: http://www.cncsharktalk.com/viewtopic.php?f=9&t=1342

Re: To stiffen the Z axis.

Posted: Thu Jan 04, 2018 7:30 pm
by BillK
yes, I got 0.0285" when I calculated the deflection many moons ago. http://www.cncsharktalk.com/viewtopic.p ... 0&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.

Posted: 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