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Members Machines / Re: Contemplating some upgrades to my CNC Router
« on: March 24, 2023, 14:47:30 pm »…Something to keep in mind when doing your testing, is that the way the controllers are written they wont tell you or flag an error if you have not achieved the set feed rate,…………
In crude means the constant frequency of the motor is an indicator but in this case, I’m pretty sure I’m getting to 9000mm/min very quickly, pretty much as the acceleration setting dictates One thing I learned about videoing equipment in action, when you use a viewer with super slow-mo with fractional time display, you can very accurately clock the duration of events. In this case the longer 9” jog stroke, and compare it to the expected speed.
I also use elapsed time when I cast metal to estimate the metal velocities in the feed system. I weigh the casting afterward and from that can accurately calculate volume, and since know the cross-sectional area of the feed system all I need to do is watch the elapsed time of the pour and all that gives me a good estimate of metal velocity in the feed system.
…EDIT to add just found this for the measuring software.
https://www.youtube.com/watch?v=hnHjrz_inQU
That’s the thread I was talking about in post 47 above.
...I did start perusing some of the builds at mycncuk.com. I took in the laser leveling thread. I think I’ll just have my beams precision ground because I have access to very good source for that, but I do understand the approach with a thin walled beam, and also the grouting between concentric tubes for stiffness, dampening, and weight reduction, and the laser measurement is quite ingenious. One thing I didn’t follow, he said he would do the same on each side of the beam. I can see how he could work each side flat, but how will it insure the two sides/surfaces are parallel?...
The grinding equipment at my friend’s shop will prep the beam surfaces better than I could ever achieve. I have to choose my battles as to what I do on the cheap so I can devote my time to the rest of the build.
I’d be more interested in using a similar method to level the rail beams with other beams as I assemble and level the router bed. I’m thinking I’ll just buy a 20ft stick of the structural profile, cut them all to length, and drive them directly to my buds shop to have one side of each piece ground at the same time. Then it’s a matter of completing the machining details and assembling them accurately, which I’ll likely do with threaded fasteners to allow for positioning. Their equipment is big enough that I could give them a 4ft x 4ft weldment, but that would become impractical for me to machine, move, and construct.
As an aside, I sure hope the security cert gets sorted soon. Between the site crash and this, there's no actvity. Members can become acustom to its absence and when a site owner becomes distant and disinterested.......it can lead to the death of a forum.
Best,
Kelly