Automotion Components Linear Guideways
What are linear guides?
A linear guideway is simply a rail that can carry an item through a defined linear path from one place to another. Linear guideways or rails are generally used with carriages and must be durable to withstand the wear and tear of repeated travel. Our linear guideways come in steel, stainless steel, and anodised aluminium (reinforced with hardened stainless steel raceways) and offer accurate and reliable linear motion.
Features
L1016 Linear guideways
Linear guideways are widely used throughout industry for heavy-duty and precise applications.
Precision high load rails
The use of steel balls and the design of the carriages and guideways mean that the rails can accept very heavy loads and signifi cant moment loads. Our rails have circular as opposed to friction coefficient, lower driving resistance, lower wear and lower energy consumption.
Cost-effective
We can cross reference other manufacturers’ part numbers including THK, INA, Bosch, IKO etc.
Rigid and precise
• High load rating.
• High moment load capacity.
Stocked
7 rail profiles ready for same day despatch. Lengths up to 4 metres.
Product Selection
Rail sizes
Carriage types
Carriage lengths
Rail types
General Guidance
Load capacities – explained
• A number of load figures are stated for load capacity:
Dynamic Load – this is the main fi gure considered for linear guideways. It is the moving load that the system can bear. It takes account of the total moving load as well as considerations such as impact, vibration and fatigue.
Static Load – this is a load that is constant for an extended time (i.e. the dead load the system can bear before any movement). It can be in tension or compression.
For these linear guideways the radial and axial load capacities are the same.
Moment loads are twisting loads generated by off set loads in either X, Y or Z planes. Moment loads can be reduced by adding further carriages or rails to reduce any twisting of the carriage due to the load off set.
Straightness of rails
- The measurements of the straightness of the system are taken from the running accuracy of the sliders over the length of the rails (given in microns) – see system precision page.
- For standard accuracy this equates to around 20 microns for a metre length, increasing to 35 microns for a 4 metre length.
What lengths can be provided?
- We have standard rail lengths. These are based on the hole pitch of the rails and end machining to provide an equidistant length to the first and last hole centre.
- However we can cut the rail (from stock) to any length required – we just need to know the distance required to the first hole.
- In general our cutting procedures allow for a ±2mm accuracy on the overall rail length. If greater accuracy than this is required then we have to machine the end accurately (rather than cut it) and this involves extra time and cost.
- Standard maximum length for each rail size is around 4 metres. Rails can be joined together but the preparation needs to be made in our workshop. The rails will be marked clearly with the ends to be placed adjacent to each other.
Installation
- The linear guideways are very accurate and as a result need to be installed on accurately prepared surfaces – please see installation instructions. If the two rails are installed parallel to each other, they need to be accurately aligned – see assembly precision page.
- If you are not able to prepare the surface as accurately as required you might want to consider using our Compact Rail system, as this has a master rail (T rail) and a slave rail (U rail) that allows for structural inaccuracies.
Mounting the carriages to the rails
- In general the carriages will be supplied separately to the rails. To install the carriage onto the rails, offer the carriage up to the rails and slide it onto the rail itself.
New ball chain technology
Our new and improved linear guideway systems include the latest “ball chain” technology with the following benefits:
- Higher maximum velocity.
- Lower heat generation
- Lower noise generation.
- Very smooth running.
- Optimised lubrication system
- Even load distribution
- Longer service life
The rotating balls in conventional profile rail guides have point contact between each other. The rotation speed at the contact point is double the speed of the balls. The contact area (A) is so small that the surface pressure (P) tends towards infinity. This leads to heating and wear of the balls and the linear guide system.
The chain system in our new linear guides have a relatively large contact area (A), this significantly reduces the surface area pressure (P). The rotation speeds at the contact surfaces of ball and chain are the same. The ball chain is used to transport the lubricant and to create a lubrication film on the balls. The design of the carriage allows effective supply of lubricant from the lubricant connection to the circulation areas of the ball chains.
This design of the of the ball chain ends in connection with the spacer ball closes the circulation and makes the movement of the carriage smooth and quiet.
New technology
It is not possible to keep the distance of the balls (C1, C2) constant in conventional linear guides. These irregular distances between the balls lead to uneven running behaviour.
The new ball chain system also allows the balls to be continuously supplied with lubricant, which reduces wear of the metal. This significantly extends the service life of the system and reduces lubricant and the maintenance intervals.
We can coat our rail with a type of corrosion protective finish:
- Raydent coating; this is an electro-chemical process that applies a black oxide-ceramic layer (approx. 1 micron thick) that penetrates into the metal. As coating takes place at OC the parts are not deformed. Good resistance against acids, bases and solvents.
Where there may be a high level of dust, dirt, weld splatters etc. we can provide bellows covers to protect the rails.
