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#1
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
The dimensions are a mess.
I'd recommend trying to move dimensions outside the border of the part whenever you can. Just doing that will make it far more readable. If you're sending this to a sponsor / vendor, consider whether you really need accuracy to the thousandth on ALL of those dimensions. (You don't.) Since you're dimensioning to witnesses, you should show the witness marks to make that clear. |
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#2
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
Thanks, that's a ton of great suggestions. A couple questions:
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Last edited by Monochron : 15-11-2015 at 20:02. |
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#3
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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Tolerances will depend on the desired end result, the material, etc. For any sort of decorative feature (lightening holes included), you probably don't need to go more than two decimal places. The title block tolerance specifies a default tolerance for dimensions that don't call them out explicitly. Last edited by Madison : 15-11-2015 at 20:58. |
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#4
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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.
We sometimes skip drawings for things sent to the local community college to CNC or to a sheet metal shop. |
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#5
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
Would ordinate dimensions be good for this part? I usually use the ordinate system for my parts.
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#6
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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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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#7
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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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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#8
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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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. Last edited by Cory : 16-11-2015 at 00:49. |
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#9
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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#10
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Re: pic: TerrorBytes 2015 Shooter Plate (Drawing)
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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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