Anthony wrote: > >> You can get DIY circular saws with built in soft start [1] but not stand > >> alone starters for older tools. ?After lining up the saw guide on the > >> workpiece I want to slot the saw into the guide, then switch on without > >> it jolting out of alignment. ?It might be time to break out the > >> soldering iron... Vic replied: > > A circular saw is just a motor; pretty much any motor controller circuit > > or even a lighting dimmer circuit could be adapted for the job.
LOL, I see I did miss out "how?" James wrote: > Arn't triacs ON/OFF switches and to adjust the amount of power, they > simply switch it on/off quickly. Will this actually help you? For a speed controller you pulse width modulate each half cycle of the mains supply. When power is applied I need to ramp from 0 to 100% pulse width over the first 2 seconds, providing a soft start (with the saw off load). There's probably some reason it's difficult to find a circuit for this, but the annoying thing about having so little knowledge is that it's easy to imagine the circuit must be simple :-) Any advice welcomed on or preferably off list. Anthony -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --------------------------------------------------------------
