What size THK/Hiwin rails and blocks?
I noticed that the smallest blocks from Hiwin, the 15mm, have a dynamic load capacity of around 2300 lbs each (11K+ Newtons). Static load capacity is double that. Is this correct?
That's about equal to a 1-1/4" Thomson SMART bearing, and higher than that of a 1-1/2" Thomson SUPER bearing. Pretty incredible from such a small block.
So why do people even bother with 25mm+ blocks on lightweight routers? I'm thinking it's because of ebay.
Re: What size THK/Hiwin rails and blocks?
Would not a bigger rail add to the mass of the system. Like using a 400x300x20 mm steel table on 25 size rails would give less chatter (or something else) than with size 15 rails?
Re: What size THK/Hiwin rails and blocks?
Quote:
Originally Posted by
gnindit
Would not a bigger rail add to the mass of the system. Like using a 400x300x20 mm steel table on 25 size rails would give less chatter (or something else) than with size 15 rails?
A little late to the party this thread is from 2006 that's 15 years ago, a lot has changed in that time, but 15mm rails are still a good option for small size machines
Re: What size THK/Hiwin rails and blocks?
Hi GN - Rails and cars come in different accuracy classes, different car styles and preloads. If you pick the right one for the application they won't chatter. Often rails and cars are choosen via its package size vs its strength. The static strength of the car is the load at which permanent damage is done to the car. The dynamic strength allows the designer to calculate the life of the bearing in its service conditions. With CNC machines they can also be selected for their stiffness, the bigger rails are stiffer then the smaller rails. All discussed in below doc. Peter
https://www.hiwin.tw/download/tech_d...ideway-(E).pdf