1 Attachment(s)
Lubricating the Flexshaft
CarveWright/CompuCarve Customers,
(Updated August 2011)
Please read the following technical note carefully and perform the recommended flexshaft lubrication.
The flexshaft construction consists of several layers of tightly wound springs around a solid wire core. These springs are wound in alternating directions to maintain the torsional stiffness. This layered construction provides the needed flexibility, but also causes considerable internal frictional heating because the layers are rubbing against each other rapidly as the shaft spins at over 20,000 RPM. If there is not sufficient lubrication within this layered structure the flexshaft will heat up to a temperature that is higher than recommended.
We have found that a penetrating lubricant containing solid molybdenum disulfide particles (moly) yields superior results. No grease!!! Use extreme caution when using any lubricant. It can be an irritant and is usually toxic.
We recommend that all machine owners purchase this lubricant and lubricate the flexshaft according to the following procedure:
1.) One way is to lay out a plastic bag or sheet long enough to lay the flexshaft on. Using gloves and eye protection spray down the entire length of the flexshaft. Rotate the flexshaft and spray again. It is important that you let the oil penetrate the core. Another way is to place it in the bottom of a bucket and let it soak. Do not force a bend in the core.
2.) Let the flexshaft dry thoroughly and then wipe off any excess lubricant before placing it back into the sheath. It can be wiped off with a lent free cloth or strong paper towel. You do not want excess to run into the bearings of the spindle.
3.) Push the core back into the sheath and make sure that it slips into, and engages, the cutting motor. Turn the core with your fingers and feel for resistance of the motor. If the shaft spins without resistance push the core in as you slowly rotate it. You should feel it engage in the square slot in the motor. It should drop into the hole about 1/2".
4.) Monitor the flexshaft while running your next project. Normally, the entire length of the flexshaft sheath will be the same temperature and slightly warm.
If the sheath is running hot to the touch or exhibits localized hot spots along the length please contact us. Please contact us if you have any questions regarding the procedure.
We also now have a new "Care of the CarveWright Flexshaft" document that will help you identify causes of overheating. Check for these causes first! SEE ATTACHMENT
We are often asked, HOW OFTEN DO I LUBRICATE THE FLEXSHAFT?
1) A new Version C machine or remanufactured machine from LHR will arrive already lubricated and should not at first need to be lubricated.
NOTE: A new Version C machine or an older model machine that has recently been installed with the CarveTight Spindle may at first run hotter than normal until it is “worked in” (about 10 hours of carving time).
2) If purchasing a used machine, it may be a good idea to lubricate it according to instructions after you first get the machine.
3) If you store your machine for the winter, summer or school breaks, it may be a good time to lubricate it before you start using it again.
4) Beyond that, it will depend on the amount of usage or non-usage your machine undergoes. The best policy is to periodically place your hand in the middle of the shaft where it curves. Remember there is friction, so it will be warm. If it is too hot for you to hold your hand on the flexshaft or is over 70º C (158º F) when testing with an infra-red thermometer then you should consult the "Care of the CarveWright Flexshaft" document to rule out any sources of overheating and then it may be time to lubricate. Others use.
WARNING! Over lubrication can be harmful to your machine, especially if you are not doing it properly.
Thank you again to all of our customers. We value your input and as many of you can see we are using your comments and suggestions to continually improve our products.
Best Regards,
CarveWright Staff
