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Horizontal Expansion should use a ratio value instead of a fixed length
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· Horizontal Expansion should use a ratio value instead of a fixed length
I printed up a hole chart with holes from 2 to 30mm. I chamfered all holes top and bottom so my measurements would be of the walls. I found that from 2 to 10mm the holes were .4mm undersize with very little deviation. From 11 to 30mm the holes were consistently .2mm undersize with very little deviation.
I was surprised by the results. I had anticipated that there would be a fairly linear error (call it a ratio) with the largest error being on the smallest hole.
As a result I was unable to develop a consistent "Snot Factor" for use with horizontal hole expansion. If I have a part with large holes I set it to .1 and for holes 10mm and under I set it to .2. This has worked out well enough for me since nothing I do is mission critical. If a hole requires precise sizing I ream it with a drill bit.
Holes that pass through a model anything other than vertically are what they are. Again, a drill bit fixes any size (or out-of-round) problem if necessary.
Regarding flat surfaces - is it a ratio? If a machine can be calibrated by adjusting the steps/mm, and it's calibrated correctly, it might not be a ratio but a fixed number. Gotta think on that a bit.
I thought the Snot Factor would be my claim to fame but alas, it's not to be.
Edited by GregValiant
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GregValiant 1,245
I printed up a hole chart with holes from 2 to 30mm. I chamfered all holes top and bottom so my measurements would be of the walls. I found that from 2 to 10mm the holes were .4mm undersize with very little deviation. From 11 to 30mm the holes were consistently .2mm undersize with very little deviation.
I was surprised by the results. I had anticipated that there would be a fairly linear error (call it a ratio) with the largest error being on the smallest hole.
As a result I was unable to develop a consistent "Snot Factor" for use with horizontal hole expansion. If I have a part with large holes I set it to .1 and for holes 10mm and under I set it to .2. This has worked out well enough for me since nothing I do is mission critical. If a hole requires precise sizing I ream it with a drill bit.
Holes that pass through a model anything other than vertically are what they are. Again, a drill bit fixes any size (or out-of-round) problem if necessary.
Regarding flat surfaces - is it a ratio? If a machine can be calibrated by adjusting the steps/mm, and it's calibrated correctly, it might not be a ratio but a fixed number. Gotta think on that a bit.
I thought the Snot Factor would be my claim to fame but alas, it's not to be.
Edited by GregValiantLink to post
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