Bearings

by

Stain Dipper Machine – Lathe Work

In the Stain Dipper Machine, we have a top pulley which is mounted on a 10mm shaft that is seated in 10x26x8mm bearings.  In the last post on this topic, I showed the pulley holder assembly.  In this post I’ll show the pulley and the final assembly.

Here is the finished pulley, made from a 1″ long by 1.5″ diameter piece of brass.

IMG_2253

Here is the pulley mounted on the top of the machine.  This is a satisfying point in the project because of all the ways this could have been solved, we chose an elegant, smooth, and accurate one.  You can’t buy this specific part anywhere in the world – we designed and made it just for this purpose.

IMG_2255

Here is a picture of tapping the pulley for a M5 set screw.

20180713_000439

This is a picture after the first operation was complete.  Now we need to turn it around in the lathe, recenter it, and finish the other side.

IMG_2247

Here is a picture of the part in the lathe.  Notice the difference in surface finish?  The shiny area is freshly cut.  The dull area was original surface.  The semi-dull area was shiny just an hour before, but oxidization got to it that quickly.

IMG_2248

A view of the spinning 4-jaw chuck and quick change tool post.

IMG_2234

by

Stain Dipper Machine Top Pulley Assembly

One of the key components in the Stain Dipper Machine is the top pulley assembly.  It is crucial that it normalizes the unspooling location of the cable so it does not put lateral forces on the slider rod below.  To this end, we designed and created 3 components out of UHMW (Ultra High Molecular Weight Polyethylene).  It’s a nice plastic to work with, and super tough.  It cuts like butter but has a lot of strength too.  This is a 10mm hardened shaft with two bearings pressed into the UHMW.

2018-07-11 - 121824

Here is a picture of the 3D model.  As you can see I haven’t trimmed the shaft yet.

2018-07-11 - 122003

by

Stain Dipper Parts

Here is a screenshot of some of the parts we’ve designed for the Stain Dipper.  All of the mechanical parts are in the design and correctly positioned and all the hardware has been ordered…

Here are several of the parts from Fusion 360

Fusion360_2018-07-05_02-41-05

Here is a servo motor mount and custom made pulley.

Frame v27

Here is a small piece of Nylon used to connect a 1/16″ cable with a aluminum tube.

Fusion360_2018-07-03_22-27-15

by

Using Solidworks to design Stepper Motor Assembly (1)

Have recently acquiried a nice stepper motor from Jameco Electronics.  It is a small motor, less than 2″x2″x2″, but still has substantial torque.  I will get into more Arduino + Circuits + Electro-Mechanical detail soon, but for the moment, I wished to share a couple of screen-shots of the 3D model and the actual parts that I am modeling and assembling.

In this model, I’m (quite happily) making heavy use cross-part references in the assembly.  I caught onto that concept by reading the Top Down Design Overview at the SolidWorks website.