It sounds like your coil machines are not set up right for what your doing ,if they are they will stay in tune for a long time with basic maintenance.Each coils should be setup to a certain task. If you like fineline for your coils set a superfast machine use a size 10 bugpin tight 5 grouping or a size 12 super tight extra long taper 5 grouping.the trick is to use a high quality small diamond #3 tip such these if your have problems with ink flow use well made small round tips.
I had a partner that was snaping springs all the time as he was push to hard n fast against the skin and craking to many volts as he had not readout. Also use high quailty springs that actually flex when they become to thick they are no longer a spring and will snap as you have to use more volts to push them.also stay away from pre-bent creased springs they to have less flex and are a one size fits all method. The spring should be bent /rounded to each frame etc.use springs sizes 16to20 for best results,
You can use for instance a 20front and 18 back and a 18 front and a 16 back or reverse them:stiffer front spring is faster for lineing & bng shading ,light front for color/color blending. you can also use the same size on both front and back but they tend to run kind of middle ground aka a all rounder
Color machines should run slow and hard but with meduim hard give and long stroke,
#1shader run two different ways -#1 portrait & relistic: medium long storke with soft give and medium slow speed for washes
#2shader for color blending and standard 3 black shading and whip shading- short stroke medium give and meduim speed.
and two liners one set up with cut back front spring and very litttle flex in it. this one should be set to run super fast with a long stroke and a floating type meduim soft give to be use with small liners so you dont get blow outs
second liner should have standard lenth springs and have med. length stroke ,fast speed and medium hard give.
buy a eikon style powersupply for you coils and it will help you tune them.
Hope this helps if you dont know this already.![]()
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