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 51 
 on: September 11, 2019, 10:03:06 10:03 
Started by w41k0v3r - Last post by w41k0v3r
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 52 
 on: September 11, 2019, 09:49:56 09:49 
Started by Parad1gm - Last post by Parad1gm
Good <Insert Time of Day>

Its been a long time dream of mine to have a large format cnc. I've recently gotten a cheap 2417 China special to get some experience with cnc in general and i think its time to start building a much larger machine.

Over the years I've been collecting parts to put a machine together. As of tight now I'm looking at using the two 1000mm x 16mm linear rods and the 1 acme rod that I salvaged from a tape change unit as the start of my X Carriage and some other rails and acme rods that I've salvaged to build a Z carriage that will do about 6" of height.

I will most likely be buying two 1000mm x 16mm supported rods to make my Y rails.

I'm debating just using 10mm GT2 Belt instead of the acme rods on all axis (Other then Z)

I have 4 Nema 21 motors and will either be using GRBL with A8255 controllers or I have a 3 axis Parallel controller that uses the TB6550 (I Believe)

Build material will most likely be doubled up 3/4" MDF initially

Spindle will initially be a 500W China special with intent to but a 22Kw spindle

Looking for some feedback / suggestions / thoughts / criticism on my choices for parts

As for design i'm open to suggestions.

 53 
 on: September 11, 2019, 08:23:40 08:23 
Started by w41k0v3r - Last post by sphinx
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 54 
 on: September 11, 2019, 03:39:24 03:39 
Started by Shanmugam Sundaram - Last post by Shanmugam Sundaram
Countryindia
Notevb6 projects
hobby

 55 
 on: September 10, 2019, 12:27:16 12:27 
Started by ibi - Last post by ibi
CountryPakistan
NoteI am learning C for microcontrollers as a hobby.
I know assembly and can help with that to anyone.
The reason to join, is to communicate with the people in forum and enhance our experience.

 56 
 on: September 10, 2019, 04:47:35 04:47 
Started by w41k0v3r - Last post by w41k0v3r
CountryGERMANY
NoteHello everyone,
my name is Marco and I started my own electronic lab in Germany. I just bought a Rigol MSO5k DSO and some soldering equipement. I already have some project on fire and hope to share with you some stuff very soon :)
Regards

 57 
 on: September 09, 2019, 04:55:26 16:55 
Started by keydarkman - Last post by keydarkman
Countrychile
Notestudent

 58 
 on: September 09, 2019, 04:00:24 16:00 
Started by techneo - Last post by techneo
It may use what is know as "locked anti-phase". An h-bridge is fed a pwm signal, which is usually around 20khz. Designers use 20khz so humans can't here the coils humming. At 50% duty cycle the motor is locked. If greater than 50% the motor moves one direction. If less than it moves in the opposite. The motor has an optical encoder that feeds back position information to the cpu. A pid routine is preformed to match the target signal(gas pedal) to the current motor position( carburetor valve).  Target position - motor position = error signal.

In the last few years Toyota had some throttle sticking problems. I would rather have a spring loaded cable or linkage.

Here's a video that shows locked antiphase
https://www.youtube.com/watch?v=zu6k8kHkd9M



Wavo.... great... You are the first one from whom i have heard this term " Locked anti-phase". Overall it is a very good idea from the standpoint of economy of hardware. Will definitely try it out....

Genuinely appreciate your effort....Smiley

-techNeo

 59 
 on: September 09, 2019, 01:52:09 13:52 
Started by techneo - Last post by Checksum8
Ok. We would use a PWM signal ...probably at 1 Khz ( the PWM freq will be determined by the time constant of the DC motor).
I think that i need to use a PWM freq of 20 Khz ( got it from Utube videos)  to determine the speed of rotation....

-techNeo

It may use what is know as "locked anti-phase". An h-bridge is fed a pwm signal, which is usually around 20khz. Designers use 20khz so humans can't hear the coils humming. At 50% duty cycle the motor is locked. If greater than 50% the motor moves one direction. If less than it moves in the opposite. The motor has an optical encoder that feeds back position information to the cpu. A pid routine is preformed to match the target signal(gas pedal) to the current motor position( carburetor valve).  Target position - motor position = error signal.

In the last few years Toyota had some throttle sticking problems. I would rather have a spring loaded cable or linkage.

Here's a video that shows locked antiphase
https://www.youtube.com/watch?v=zu6k8kHkd9M


 60 
 on: September 09, 2019, 09:40:37 09:40 
Started by sfiga69 - Last post by token0
I would consider sharing via i2p and tor. BiglyBT is great (but heavy) opensource bittorrent client with support of i2p and tor.
Also look for overlay/mesh networks hyperboria (based on cjdns) and yggdrasil (successor of cjdns, same devs).

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