In this video you see the first part of the build from my 4th axis.The plan is to use this axis not only for indexing but also for cnc turning on the mill. In addition a tool changer for turning tools is planned later which will be attached to the spindle.I have deliberately chosen a closed system because I do not want to have chips on the belt or in the motor.The construction itself gives more work, however, because there are a few more plates to mill.Who wants to rebuild the axle can do this without covers but I would then recommend a thicker base plate because without the covers is lost some stability. The height of the axis including jaw chuck is 120mm and is deliberately built so low that I can drive over it with my portal milling machine, which has a portal height of 125mm.The whole parts have cost me 250 euros where I bought on Ebay for 50 euros aluminum remnants and was lucky that matching plates were there.I also use a 100mm 3 jaw chuck, a closed loop stepper motor the JMC IHSS-60-36-31, HTD-5M belt with 25mm width and 2 pulleys with 40 and 26 teeth.The gear ratio is 1:1.54 which corresponds to 4.7Nm torque and a speed of about 2000 rpm.In the first video of this series I will show you the production of the shaft on which a bearing seat is. Then the manufacturing of the shaft coupler with the 2nd bearing seat and the nut for clamping.The CAD files for the rebuild you will find in the video description of the last video when I am sure that everything fits as planned.
JMC IHSS-60-36--31 € 70,-
Toothbelt HTD 5M-25 - 340mm. €23,58,-
Toothed belt pulley 40 5M 25 €16,60,-
Toothed belt pulley 26 5M 25 €10,80,-
100mm 3 jaw chuck €60,-
Aluminum remnants from eBay €50,-
Sets of screws €20,-