...If you say the A6 measures correctly but does not reach the correct depth when used, then possibly 1.0mm = 1.5mm? And speed?
REDUCING A6 DEPTH ERROR
Hard to say - no way to measure and too many variables alter A6 depth...
Below is a list w/ workarounds to reduce damping / depth error:
- SKIN TOUGHNESS: reduce it by keeping skin (very) wet w/ a (sterile) water spray bottle;
- LUBRICATION: lubricate w/ water as per above
(oils = great lubricants, but go systemic w/ needles - are there any "inert" oils?)
- NEEDLE COUNT: as low as possible - 3 to 6 would be ideal, but not seen them yet...;
- NEEDLE SHARPNESS: replace every 5-10min (dr.pen's are cheap);
- NEEDLE DIAMETER: as small as possible (if different diameters available);
Even w/ the above, you are still left with depth guesswork:
to achieve 1mm, do I need 1.3, 1.5 or 1.8mm?
A possible workaround is needle w/ friend's D2 @1mm,
and set A6 depth to replicate the damage (bleeding);
The best long-term solution = D2.
A6 OPTIMAL SPEED
@FOLLICA: speed is not important - hole count is.
@DEPTH ERROR: we could speculate that higher speeds reduce depth error, cause they have higher kinetic energy, thus more easily overcome skin friction -
but this is assuming that skin penetration energy is not speed dependent, a bold statement in itself - not enough data for soild conclusions...