First Detail Part Prints

[fishbelly]

These are my first two detail parts. The brake cylinder drawings were made from prototype measurements I took. There is a left and right side and that is determined by the actuator arm angle. I drew them full scale so EVERYTHING is there. I did this so I can scale them down to any scale I want. These are HO and the only additional work needed was to adjust the size of the mounting pin when scaled down.

The GP jack pads were drawn full scale from a drawing Gordon Cannon sent me a long time ago. I used them as a reference and then modified them with measurements I took from the prototype. I then added the casting marks. The casting marks are not very visible, but a representation of them is still there.

The little hole you see in the top of the brake cylinder is an anomaly and all of them had it. I have no idea where it came from. It is not in the drawing. Easy enough to fill with a little putty.

These fit perfectly on the Athearn Blomberg side frames. The actuator arm lines up with the bracket and the pins fit the holes.

These parts are for my Atlas GP38 model build. Next up is a pilot plate and step wells.

Although the plastic looks beige in the photo. They are printed in a medium gray. The photo editing changed the color.

PRINTER: Uniformation GK Two
RESIN: PHROZEN Basic Gray
LAYER HEIGHT: 0.03 mm
BOTTOM LAYER COUNT: 6
BOTTOM EXPOSURE TIME: 30s
LAYER EXPOSURE TIME: 1.9s
TIME TO PRINT: 1 hour 21 minutes

HO SCALE JACK PADS & TRUCK BRAKE CYLINDERS by Brian Banna, on Flickr

[ncrc5315]

These look really good. What are you using for your design software? Are you happy with the new printer?

[12bridge]

That little hole is a slicing error. It happens.

[Mr. Trainiac]

The hole is probably an air bubble. I would try re-orienting the print so the cylinder is at more of an angle. Rotating the part so the brake lever is vertical will probably fix the hole and improve the brake pipe flange too

[fishbelly]

ncrc5315 - So far I like it a lot. There is still a lot I need to learn about it and most likely a lot I need to learn to get even better and crisper prints. I am enjoying it though. I have settled on two slicers. Mostly CHITUBOX and also the slicer that came with my printer. It is VERY basic, but it produces good surface finishes. It has an "optimum" surface finish orientation setting.

12bridge - Thanks for the info. Like Mr. Trainiac, I thought at first it was an air bubble, but it is on all the brake cylinders. I am running a second batch right now to see.

Brian

[12bridge]

If its random here and there is air, but if its a consistent hole in each part in the same spot its a slicing error. Re-slice and you should be OK. Sometimes it helps to move the part just a touch too.

[ambluco]

Agreed. There is plenty of reading online on how much to angle your parts compared to the plate. Best resolution and less issues with prints. Mine is 43.8766973° for the layer height I print at.

Dec 3, 2023 11:03:06 GMT -8 Mr. Trainiac said:

The hole is probably an air bubble. I would try re-orienting the print so the cylinder is at more of an angle. Rotating the part so the brake lever is vertical will probably fix the hole and improve the brake pipe flange too