I forgot, was negligent that point when painting them. Should not be good for rigidity but also accuracy. Paint will be removed on the spindle mating surface. Thank you
Your question is not perfect clear but let me give my comments. Adopting steel tubes (tank steel?!) cut by several pieces and assembled by bolting has couple of reasons. First, pieces of steel tubes could be handled by hand. Second, combination of tubes could make future design updates enable by adding additional tubes and reinforcements as design demand. Actually as they are made at home (workshop) not in plant, one piece of bulk frame could not be made. This would be a basic reason actually. Reason of adopting stepper motor is that I didn't have enough technical knowledge for the servo motors in CNC machine at that time. But I am on preparing upgrade my machine with servo motors. Related information will be uploaded in order. Below, I copied portion of explanation comment of "Part#1, Frame build" already uploaded in RU-vid. Please refer to it. Thank you~ 1. Design contents of the Frame 1) Overall dimension : 436 X 570 x 830 (W x L x H) ** Machine drive unit stroke : 400 / 220 / 262 (x / y / z axis) 2) Law material : Steel tube 100 x 100, thickness 2.0 3) End plates (Th.8.0) with tap nuts or Closing plates (Th.1.6) for both end of tubes 4) Nut plates (Th.5.0 or 8.0) inside of tube for fixing hang-on parts 2. "Bricklaying" ("Lego brick masonry") concept Each Frame assembly (Base, Column) has mainly 4 sets of frame. 2 Main frames each side and 2 Spacer frames in between them with 130mm long bolts for connection. * Total 64 bolts are used for entire Frame assembly. * Every frames are filled with Epoxy concrete (w/gravel and sand) inside. 1) Merits - Frames avoided heavy metal work (casting, milling etc.) in parts fabricating - Lower weight, so as to be handled by hand, without help of crane. * Highest weight of Column 9.6Kg in Frames - Easy future design change (upgrade, rebuild for enhancing the capacity) by adding frames and reinforcements as needed. 2) Risk - Difficulties of dimensional accuracy control of the assembly with this concept, several times accuracy check and adjusting had been done through the frame building to final assembling of driving parts (Linear block, ball screw etc.)
z-axis : stepper motor NEMA34 / 12Nm y-axis : NEMA34 / 8.5Nm x-axis : NEMA24 / 4.0Nm ** NEMA34 / 8.5Nm for all 3 axes would be the optimal solution in my machine I think. ** There was a little worrying about the small size of x motor as it was decided to be packaged in between x-base plate and work plate. It is running well now but feels a little low power, would have been better with 12Nm. ** Tell me which component you would like to know more?
I'v learned SPM=Special purpose machine from you and then Google(:. Thank you. My machine is not very special but the frames which was uploaded in part#1 video would be something special I think. It has several part frames and they are combined mainly by bolts so that each parts could be handled by hand not by crane at home and the total assembly could be easy to be design updated by modifying the parts or adding extra parts. By the way, are you asking more upload part to part? Total 6 videos already uploaded and next ones to be. I'v been trying to include every part to parts as far as I can. You can refer to them. Thanks~
@@cncforall12 sir am very interested to you are machine building video great and you completed this session and in future you will build spm for me learning sir now am going to interview machine building and automation you are video very helpful full thank you 🙏
