All posts by bart

CNC Build Club – Chilipeppr Presentation

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Thursday 8/6/2015 @ 7;30pm we will be doing a Chilipeppr Presentation

Here is a link to the Meetup page on it.

Chilipeppr is full featured, web based, GCode sender.  GCode senders basically send your CNC toolpath files to the micro controller running your CNC machine.

Chilipeppr takes that concept to the max.  It more like a full featured front end to your CNC machine.  It visualizes the GCode, shows the status of your machine, helps with work offsets and jogging.  It also has some cool tricks it can do to deal leveling and Z probing.  It is currently compatible with machines running Grbl and TinyG.

John Lauer, the creator will be conducting the presentation via Google Hangout.  We hope to expand the presentation.  I’ll tweet out a link on @buildlog and post it here when we work that out.

We will have a machine or two for a physical demo.

Here is a link to the hangout.

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CNC Build Club – 2/5/2015 7:00pm

This month’s CNC Build Club meeting will be a demo night.  Bring something to show.  It can be a project you finished, something you made, a work in process or something we might think is cool.

I will be bringing several things I have recently completed.

The bipolar ORD Bot: This is a CNC machine I built for 2015 ORD Camp.  It is a super simple drawing machine with some fun math behind the motion.

The DC Power Supply Interface: This is something I did for Inventables that we will be selling soon.   It really cleans up the wiring when you use a DC power supply on a CNC machine.

The TB6600 Stepper Driver Shield:  This is another Inventables project.  The TB6600 can do a ton of cool CNC stuff.  Now you can interface it to the free grbl CNC controller.

The CNC Club is a monthly meeting of Chicago area people passionate about learning, building and using digital fabrication equipment.  It is held at the Pumping Station One Hackerspace.  It is open to non members.  We also have a Google Group called CNC Build Club.

Each meeting we talk about, build, train on and use CNC machines.  We have 3D printers, laser cutters, CNC routers and vinyl cutters.  Come out and join the fun.

Please RSVP on Meetup.  I will have a CNC or Inventables related door prize to a random person who RSVPs and is present at the meeting.

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CNC Build Club – Let’s Talk Stepper Motor Drivers.

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Stepper motor drivers are the things that power most of our DIY CNC projects.  There are dozens of choices.  What makes a good driver?  We will talk about that.

I will bring as many as I can find, which could be a dozen or more. Gecko’s, Leadshine DSPs, Pololu, Panucatt, Allegro, TI and others. I even have a three phase closed loop driver and motor.

 

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Special attention will be given to the Trinamic TMC261. This is a new-ish driver chip that has a lot of cool new features. The most interesting is it’s sensorless load detection. This means the driver can sense the load on the motor. This allows it to do a few new tricks. One is to dynamically adjust the current. You can set the maximum current quite high, but it will only go that high if the load on the motor requires it. This keeps the driver cool, yet allows it to power through higher loads and accelerations. The other trick is stall detection. If the motor totally stalls this is sensed and a fault pin is activated. This is being used by people to eliminate end stop switches. Rather than using pots and pins to set these values, you use and SPI bus. The driver also has a very high voltage range for a chip this size of 9-60VDC. Stepper motors love higher voltages

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I have a eval board we can play with.  This board has a motion controller on board and can take the steppers up to ludicrous speeds.


The CNC Club is a monthly meeting of Chicago area people passionate about learning, building and using digital fabrication equipment.  It is held at the Pumping Station One Hackerspace.  It is open to non members.  We also have a Google Group calledCNC Build Club.

 

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