Quote:
Originally Posted by Monochron
The sponsor is using a manual mill with DRO. We're getting fancy, but not quite that fancy.
I took a second pass and addressed as many comments as I could, uploaded here. Hopefully it is a lot more readable and missing less important info  |
I thought about the possibility that a manual mill would be used to make that part, before making my suggestions, but assumed it would be a CNC mill/waterjet/laser. That can change where you'd dimension things from.
Your new drawing looks a lot better. Could probably use some more refinement, but in echo the sentiment that this would be an absolute nightmare to make on a manual mil.
Have you shown the sponsor the general idea of whaf you want done? Or will this drawing be the first time they've seen it? The amount of work required to make all the external radii and non orthogonal cuts makes this part virtually impossible to make without expending a MASSIVE amount of time. You're looking at numerous setups on a rotary table to produce all the internal radially arrayed pockets and the external radii. The angled linear cuts on the two left lightening pockets both require complicated setups to make that a single axis move.
If I was a machinist and got handed this print and was expected to make it, I'd be cursing the engineer that came up with it... And then I'd quit. Any non rectangular features on a part are too much to ask of someone with a manual mill, for FRC purposes. Your sponsor will thank you if you can simplify the part for them.
[edit] second the comment by asid61 to do the external contours on a bandsaw and sander. If you need the weight loss from the internal pockets, you could omit them from the print and print out a 1:1 drawing, glue it to the part after machining, drill some pilot holes in the pockets, and carefully jigsaw them out.