Prototype Parts Arrive!!
I’ve been doing this for years, yet I still get excited when the new prototype parts arrive. It doesn’t matter if they are 3D Printing or CNC, or like these, MJF. All are the parts of a new custom machine.
In these few weeks a lot of special parts for a new custom machine are arriving. They look just like the CAD models, of course, yet holding them in your hand, gives a sense of accomplishment. Today some of the rapid prototype parts arrived, and they’re pretty cool.
Prototype Parts For New Custom Machine
The current big projects at Synthesis include 2 new Custom Machines. A smaller-ish one that will go into production at some point, and a larger one that will probably remain as the only one of its kind in the world.
While I can’t get into the details of what these machines do, I can say the bigger machine will speed up a process so our customer can respond more quickly to filling the needs of their customers. They have a time and space consuming process identified as a bottleneck in serving their customers. After discussing it with us, a new custom machine is the solution. It’s not a simple machine, but it will drastically change the time, space and accuracy of their process.
The prototype parts shown in the images are pieces of the new machine. While rapid prototype parts like SLS are getting better with new equipment, we must still consider how they are used. These particular pieces are made with HP’s MJF 3D Printing to hold and locate sensors, and attach a motor.
Solutions By Mixing Technologies
MJF is a nylon base, so the parts are pretty strong. If they are thin, then they are somewhat flexy, but thicker and with ribs, the parts become quite stiff. The fun thing with rapid prototype (RP) parts like this, you don’t have to worry about one area being thick or thin with respect to others. You also don’t have to worry about moldability or machinability or those kinds of things.
As you can see, none of these parts would be easy to machine or to mold.
The downside is they are still plastic, and less stable with less strength than full molded plastic parts.
In the motor mount, we want the complexity that’s easy with RP, but we don’t trust the long term stability. The motor has some weight that will rest on the mount, so stability over time and under load is important. Certainly we could design in aluminum or another CNC style, yet RP offers time and cost saving for complex pieces. So, the solution is a mix of 3D Printing and CNC Machining.
Building With Prototype Parts
To get the best of both worlds, we simply design the part with steel sleeves that glue into the MJF. The sleeves hold the bolt loads — and therefore the cantilever weight of the motor. Then, the RP material will set the location and carry the motor reaction torque. The MJF then gives the opportunity to put some style and other functional features into the prototype parts.
The mixed materials approach allows us to make the simple metal pieces to hold the motor weight and bolting loads without worrying about creep for plastic in the prototype parts. The MJF will do great with the transient torque loads. By combining the prototype technologies, we’ll get the stability of metal with the easy complexity of 3D Printing. And, we still don’t have to obey the rules of making the parts manufacturable!
Besides being a cool looking prototype, these are quite functional and make it easy to solve some interesting challenges of the new custom machine. For us, this is all part of Product Design and Development in serving our customers. Win all around.