Steinmeyer recently added Custom Precision Solutions (CPS) as our representative for the southeast USA. Dominic Mastroianni, president of CPS, is located in Wake Forest North Carolina and covers the following states: Maryland, Virginia, North Carolina, South Carolina, Tennessee, Georgia, Alabama and Florida.
Seems there is still a lot of confusion on load and life ratings when it comes to ball screws. Many people are familiar with the classic L10 life equation L10 = (Ca/P)^3 x 10^6 revolutions where Ca is the dynamic capacity in N and P is the mean applied axial load in N. Recently we fielded several inquiries on applications where an engineer wanted to know whether s/he can apply a force equal to Ca and achieve 1 million revolutions of life. Or even higher than Ca and achieve less than 1 million revolutions. The basic answer is NO! Here is why:
Often customers are a little surprised when they embark on the Geometric Dimensioning and Tolerancing (GD&T) phase of their design asking – “why must I design in such tight alignments, concentricity and squareness?” The answer is simple… so the ball screw will operate at its fullest efficiency and anticipated life!
Seems like everyone’s pushing the limit on ball screw speed lately. Steinmeyer introduced our UltraSpeed ball screw series several years ago, boasting of Dn values to 160,000. First, what’ s Dn value and what does it signify? Continue reading
Or to put it another way – the old adage was “if you want a really smooth ball screw with zero backlash you have to specify and pay for a ball screw with higher accuracy”. But is this true today?
At least once a week we get such an inquiry – someone looking for a ball nut and separate shaft long enough so they can cut it and machine the journals themselves, usually thinking this will significantly reduce lead time. And of course, compared to buying a completely custom ball screw, it may just do that. There are several reasons why we do not offer separate shafts and ball nuts, or complete ball screw assemblies with unfinished ends. Continue reading
Routinely we get a phone call at least once a week – “hello – help – I have a Steinmeyer ball screw and I just spun the nut a bit too far at the shaft end by mistake and now I have some loose balls – what do I need to do?” Continue reading
Hah – got your interest with that title, right? But is there really such as component as a ball screw that requires zero maintenance? First we should establish exactly what we mean by “zero” maintenance. This can be one of two scenarios: either the ball screw has absolutely no lubrication, that is it runs dry; or the ball nut includes enough lubricant and is sufficiently protected such that no further maintenance is required for its lifetime. BTW for either scenario the answer is pretty much “NO, it’s not possible!” Continue reading
A question that often comes up for miniature ball screws – how do I lubricate it if there is no port on the ball nut? Good question! If you check our web site there is quite a lot of detailed information on lubricant types and wiper types, including precise amounts to use when re-lubricating:
There are three common methods to create a ball screw thread profile – rolling, whirling and precision grinding. But what’s the best one and what are some key differences between them? To answer that question one first has to understand the nature of the application. Continue reading