Before going on I'll mention i have Quadriplegia, more movement in my arms than most people think when mentioning quadriplegia and grouse movement in my hands, due to tendon transfer operation.
Such as circumscribed polygon and still scratched my head a little LOL. I'm not an engineer, i have a degree in social work so i've had to look up some of the terms used by both of you. I say the above because there's certainty in my mind that a nominal perfect hole 25 mm will be produced at 25 + /- 0.1 by the very best machines and +/- 0.2 as a normal makers tolerance. The attitude of the part in the printing machine - if you want it made in a certain orientation, it must be specified or there's a chance it might be put with other parts and orientated anyhow to fit inside the printing cubic volume. The speed of deposition and 'wander or slump' as it solidifies. How accurately they can place the nozzle in a perfect position. There are sadly other factors here though in the comes down to when they extrude the plastic through the nozzle. Talk to supplier, you want it to be 100% representative of the whole part and a quote.Įverything below is the makers resposibility - it's included in their general making tolerances. 'Material off' situations are much preferred to the other way as it might not be possible at all !Īlso, once you have decided a hole size and it's construction method ( maybe using a circumscribed polygon etc), to keep costs low, split the model up and only print the part you're really concerned with i.e gimbal housing bit. I also had a thought.if a hole size came back at 24.6 and you wanted 25, why not sand paper / abrade out to 25? wouldn't that take only 5 minutes to do. Nonetheless it would produce a very accurate STL file where a 25mm circle would fit perfectly. Jacants 'work around' nicely side steps the issue of 'resolution' - but it might be more work to pull / change it's size or add other features in or intersect with it. The image below took me about 2.5 weeks to complete. Sorry for the dumb questions but i would rather ask it and learn than make many errors. To obtain the minimal settings i will need to talk with the printer. I suppose how small this could could be depends on the variance of the printer. What is meant exactly by the deviation and what happens as this is changed?Īngle is the degrees the triangle meet at. Resolution deviation and angle, are these your recommended settings or just an example?ĭeviation is set at 0.25. The internal design of the gimbal housing needs to be smooth. The outer surface of the of the spine and gimbal housing I would like to have some texture since these will be covered with leather which will be stitched and glued in place. Can a surface have different printing specs? See below image. In your first image of changing the STL file from fine to custom:įile is set to design so the whole design has these printing specifications. So the smaller the surface area of the triangles, changes the angle they meet at, reducing the peaks. Thanks I did observe the triangular nature of the STL file and I understand the flat facets and circles idea (i facet gems as a hobby). I’ll make a few changes to the first design before printing and hopefully it will be the last.
I will do another print but at $150.00 each plus the carbon fibre strip it will get very expensive quickly. It has enabled me to change the design to overcome unforeseen issues as the design took place. The basic design has been in my head for years but DesignSparks Mechanical has enabled me to put it to paper and share my mental thought so people can see and understand what i'm talking about. Its hard to describe the design without seeing it. I originally wanted to make this out of carbon fibre but couldn't find anyone to do it so I went with nylon and added a carbon fibre strip internally in a different section that takes most of the load. It will need this thickness to cope with wear and tear. This would give me a 2 mm wall to hold the butt cap in place. The EVA butt cap can only be reduced to 25 mm maximum OD which is to fit into the item's ID of 25 mm. Tim The OD of the frame of the splint is 29 mm to match the EVA rod grip. I read an article answering a question about making a smooth print which suggested to do the same thing Jacant but I didn’t know if this would reduce the variance.