soft start circuit for angle grinder - anyone done one?

I was thinking something along the lines of a light dimmer type circuit, with a suitably rated triac, turn the knob from zero to full to turn it on. Or modify it with a resistor/capacitor type arrangement to simulate turning the knob from zero to full over a couple of seconds when started. ?

Wimp, just get a good grip on the thing before turning on the power ;)

Yes I know they like to try jumping out of your hands

Solutions? How technical are you?

Series resistor shorted out by a timed relay? Simple but mechanical.

Current surge limit thermistor as used in power supplies? Bad because they need a long cool-down period after use, or use a timed relay to short the thermistor during use so it's cool for the next start.

Some sort of TRIAC based slow start? Haven't seen one, but then I haven't been looking for one either, it's a simple enough problem.

If there's room, otherwise inline.

Ouch, big enough :)

Start by looking for a drill speed controller, and think of sending a ramp voltage into whatever the speed wiper goes into, but it depends on the circuit you start with.

Grant.

Maybe just try some anti-seize on the threads (& retainer face?). Loctite makes a good anti-seize compound. Lots less work......

His complaint is that it tightens the blade to much, getting a grip has nothing to do with it.

This is the classic solution for a soft start. Doesn't even need a timed relay. The initial voltage drop causes the relay to delay until the motor comes up to speed.

................. Zim

learn to spell (s/to/too/)

Grant.

The extra o just wastes bandwidth just like this post (and your post)

do it up tight before you turn it on.

All the 100mm cheapies I've used had no such thing, I never used the spanner just gripped the disc and turned it hand tight. after use it was still hand-tight.

If the disc slips at startup it will overtighten the nut.

It's a big one then, you've got to get the nut really tight on those, two-hand tight. You say it's old, perhaps you need to replace the retainer nut and/or spindle. Does is look worn ?

go to makita and grab the spare-parts diagrams, if it's not a feature of the rotor their replacement part for the new models may fit yours.

?? 100% natural

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try this...

mark

I have an endico angel grinder which doesn't require this so never tried this before.It is long lasting and durable.

On Thu, 5 Sep 2013 04:17:01 -0700 (PDT) snipped-for-privacy@gmail.com wrote in Message id: :

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I'll take thing that a spammer would say for $100, Alex.

I wonder how much torque's required to grind an angel?