Hi @Topsie,
Thank you for your design and efforts. This will be my intro CNC machine and I am stoked!
I have some questions about the T8 Nuts:
- Are there on the bill of materials? I didn't see them
- You use a brass T8 Nut on one side and then a printed nut on the back side. Can I also use a bearing on the back side? I fear that unless the spacing between the nuts is perfect, the threading of two nuts will cause unnecessary friction. Does that make sense?
Thanks again!
This is not unecessary friction, this avoid the backslash ^^
Thank you for the amazing designs and information you provide along with them! I have been looking to build a new CNC machine after building my MPCNC by V1 engineering. Have you had any issues with the v wheels wearing out on the aluminium or do they become loose? I have looked at some of the open builds plans and they use the eccentric nuts to adjust the fit of the wheel on the profile.
Also, I am concerned that the 2 Y-axis would easily crack and move side to ride or blow out completely if the machine bound up on the X-axis. How strong are the 4 corner mounts on the Y-axis and would it be a good idea to join the Y-axis together as an open CNC design does for strength in the X direction?
Again thanks for the work, Alex
Thanks...I had just got finished working in Adobe After Effects and the z axis is forward/back...lol...I got confused. How many Nema 17's and 23's should the new model have (2 Nema23's for the y and 2 Nema17's for x,z)? I had noticed a package of 3 in the links you provided so I was just wondering. Also, Is it stable just running with Nema 17's? I guess my question is what is the reason behind the Nema23 upgrade? Money wise, it doesn't matter to me, I just want the more proficient machine and I'll be ordering part in the next couple of days.
@TheUntidyTech : i havent got any issues whith VWheel, i have a 2 parts screwed togheter which press firmly the wheels against the rails, no need excentric nut with that system
The 4 corners of the machine are screwed on a single same desk, so they are join together ^^
@DB_Texas_PBS : You will need 2x nema23 for Y axis, 1x Nema23 for X axis and finally 1x Nema17 for Z Axis
I use my machine often, and I didnt notice any problem with Nema17.
I made the Nema 23 version after a LOOOOOT of ask from my community who think Nema 23 are better ahah
But I never got any problem with Nema 17 version, and no one who made the Nema 17 version said me that they got problem with ! Whether with the TopsCNC V1 or the TopsCNC Heavy
I notice lot of people say Nema17 is not good for a CNC, but a lot of them has never tried it ahah
The Nema23 are more powerful so they can rotate and accelerate faster without loosing step. But the reality is that the machine is 3D printed plastic, so the rigidity cant assume to go faster than 2000mm/min or something like this during milling WOOD !
I can drive my machine to 3000mm/min without milling with nema17, but you cant cut anything faster than 2000...
In my opinion Nema23 are useful for one simple reason : Intensive use of the machine.
But my mindset is to test before talk, so I will test Nema 23 before saying anything, and i will write a feed back in the design page of the nema23 version for all who wqnt to know advantage of the nema23 version
I just read the thread that mentions the eccentric nuts a lot and it makes sense about them just rolling back to a loose position! By joining the corners I meant more of a direct connection between the two rails, for example, another extrusion across the front or back connected to the metal extrusions already there. I can see myself having the feet snap on one side each and the whole thing tipping sideways :P I have no experience with this I just know i have cracked a lot of PLA pieces on the MPCNC as well as stress fractures in the parts.
Yes i understand, the design allow you to screw the feet in an extrusion profil with some T nut instead of screwing it directly in the working table ^^
Well, considering that you have already tested, and it is your design, I'll just go with all 17's and upgrade later when the other has been tested and proven (if I even need to). Thanks for all the info and for taking the time to answer.
Okay no problem !
Salut à tous les lecteurs, quelle différence y a t'il entre les roues V-slot pleines et celles en profile V à l'intérieur. La rigidité est elle aussi différente?
Merci à tous.
Photos des roues
