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Unread 16-11-2015, 00:23
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)

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Originally Posted by asid61 View Post
How are you planning on machining this? You may not need to dimension a significant portion of it if a sponsor is just lasering the thing anyway and has tolerance numbers for you.
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

Last edited by Monochron : 16-11-2015 at 00:35.
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Unread 16-11-2015, 00:31
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)

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Originally Posted by Monochron View Post
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
If that's the case, I would highly recommend removing the odd pockets and try to make things out of right angles instead. Do final countouring with a bandsaw and sander. In my experience, doing rectangular plates and holes is dead easy, but the second you want to do precise angles or curves it's time to move to CNC.
You also may want to move things to 2 decimal places wherver you don't need the precision of 3.
EDIT: Especially the odd pocket on the left; that would be extremely time-consuming to do on a manual mill.
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Unread 16-11-2015, 00:45
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)

Quote:
Originally Posted by Monochron View Post
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.
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Last edited by Cory : 16-11-2015 at 00:49.
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Unread 16-11-2015, 01:14
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)

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Originally Posted by Cory View Post
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.
They have the general idea but we haven't shown them the details yet. I can definitely change the outsides and the pocketing to 90 deg. angles and mess with the odd left pocket, but my real concern is another part that they will be machining. In the full model I posted you can see there are two spines between the plates that provide compresison for the ball. Those have to be curved to a precise radius. Here is the drawing for the spine. Is making something like that on a manual mill out of the question?
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Unread 16-11-2015, 01:41
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)

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Originally Posted by Monochron View Post
Those have to be curved to a precise radius. Here is the drawing for the spine. Is making something like that on a manual mill out of the question?
Yep. It'd be a long and "interesting" job to mill that curve.


You're probably going to be better off doing the spines out of a material that can be bent/rolled precisely, taking care of the radius that way, and then drilling the holes.

Or you could rough-cut it with a saw and sand/grind it down, as suggested previously. Use the mill for hole-drilling only (and if it's just that, there's a drill press wanting some attention, I'd assume).
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