{"id":1794,"date":"2016-11-01T11:00:42","date_gmt":"2016-11-01T16:00:42","guid":{"rendered":"http:\/\/blog.misumiusa.com\/?p=1794"},"modified":"2016-12-20T11:36:57","modified_gmt":"2016-12-20T17:36:57","slug":"linear-guide-mechanisms","status":"publish","type":"post","link":"https:\/\/blog.misumiusa.com\/linear-guide-mechanisms\/","title":{"rendered":"Working with Linear Bushings Pt 1: Linear Guide Mechanisms"},"content":{"rendered":"

Engineers have many options when it comes to designing for linear motion.\u00a0 The need for compact and efficient designs evolved the variety of linear guide mechanisms.\u00a0 Rails and sliders are the simplest form of linear guide mechanisms, which are a combination of shafts and linear bushings (or oil free bushings).<\/p>\n

Here are the limits of using shafts and linear bushings.<\/p>\n\n\n\n
\n\n\n\n\n\n
Design Limits of Shafts and Bushings<\/strong><\/td>\nSolutions<\/strong><\/td>\nDesign Evolution of Linear Guide Mechanisms<\/strong><\/td>\n<\/tr>\n
Linear bushings\u00a0<\/a>cannot be used for rotary motion along the shaft circumference.<\/td>\nTwo shafts are used to constrict the rotary motion<\/td>\nBall spline<\/a> + Spline shaft configuration.<\/td>\n<\/tr>\n
End supported shafts configuration does not provide enough rigidity against high downward loads.<\/td>\nUse of larger diameter shaft and double\u00a0linear bushings<\/a>.<\/td>\nShaft guide rails + shafts +\u00a0linear bushings<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Advances in Linear Motion Guide Devices<\/strong><\/p>\n

Simplified depiction of the evolution is as follows.<\/p>\n

\"Figure<\/p>\n

Linear Motion Guide Devices Explained\u2026<\/p>\n\n\n\n\n
<\/td>\n<\/tr>\n
<\/td>\na\uff09<\/td>\nA ball spline has ball rolling grooves on the shaft that are free to move only in a linear direction. (See [Fig.1]). This enables the circulating motion of evenly spaced balls to be maintained and high speed response to be achieved. Other benefits are that it eliminates collision, mutual friction between balls, and produces low noise.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"figure-2\"<\/p>\n\n\n\n
<\/td>\nb\uff09<\/td>\nA guide rail support is provided under the entire length of the shaft, increasing the shaft rigidity. The mating linear bushing has a lower section removed to account for the guide rail. (See [Fig.2])<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n
<\/td>\nc\uff09<\/td>\nSince a free moving ball retainer is the bearing element, there are no movement restrictions in either rotation or linear motion.<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n\u00a0\"Figure<\/td>\n<\/tr>\n
<\/td>\nd\uff09<\/td>\nAnother linear guide<\/a> design which is principally similar in construction to b), but have ball rolling grooves allow for higher load carry capability as the rail design increases bearing contact surface. (See [Fig.3]).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"Figure<\/p>\n

As technology evolves, design components must evolve with it.\u00a0 Hence, the need for linear motion devices<\/a> to handle more load, speed, be compact, and have long life were required.\u00a0 This also allows for diversity in the design process.\u00a0 Depending on your application parameters and requirements, there may be a linear motion device for your design.<\/p>\n","protected":false},"excerpt":{"rendered":"

Engineers have many options when it comes to designing for linear motion.\u00a0 The need for compact and efficient designs evolved the variety of linear guide mechanisms.\u00a0 Rails and sliders are the simplest form of linear guide mechanisms, which are a combination of shafts and linear bushings (or oil free bushings). Here are the limits of using shafts and linear bushings. […]<\/p>\n","protected":false},"author":46,"featured_media":1805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[6],"tags":[327,302,16,12],"class_list":["post-1794","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured","tag-ball-spline","tag-guide","tag-linear-bushings","tag-linear-motion-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t