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I have a single straight that I was going to try but, after seeing Glenn’s initial post and his statements of positive outcome, I figured I’d give the same but a try.
I saw a youtube video, don’t remember where, of a guy who used a straight bit, cutting in 1 pass, and going slower than 200 ipm. Don’t know what his was set at but it was noticeably slower.
As for a source of records, I get mine from Good Will. $1 each.
ahh yeah that looks like a little bit of re-melting there
I run into that sometimes to and your right just takes your finger to take them off I would imagine if you had a air blast pointing at the tool when cutting you would fix that issue
For these particular jobs I run the carve twice, one with incremental depth per pass then a single full depth carve (to same depth as first). After the first carve the groove is usually packed with plastic chips (v-bit dont clear much) but when I run the carve for the second time the cooled plastic clear really really well.
So yes, the monogram is pretty much ready to use right off the CNC - but since it will be placed on a cake I do make sure they are 100% clean of any trace of unwanted material.
With a 1/8" V-bit I usually run at 1500mm/min at 10k rpm with depth per pass 1.1mm (convenient since max depth is 2.2mm). I can run much harder and at full depth but intricate parts and thin design elements (1/32" wide) make it cost effective to run depth in two stages and at slower feed rates.
thanks for the info I think I am going to try this out
I have been approached to make monograms like this and I always out source to a laser but you can get some fine detail with the v-bit and if its thin material it should not be a problem
I know the bit is slated for “soft plastics”, and I am not sure if vinyl record is considered soft but I was curious.
I ran one at 100 and the other at 75 ipm. Both cut full depth at one pass. Between the two, I can’t tell a difference in speed settings. Both did very well. There were some stuck-on chips but they wiped off easily with my finger (being careful not to cut myself on the sharp edge).