Router Speed Controller

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alpha
Posts: 174
Joined: Thu Apr 12, 2012 2:49 pm

Router Speed Controller

Post by alpha » Mon May 07, 2012 9:00 pm

I want to open a new topic on this interesting subject, here are two quotes from the "Rotozip or Laminate Trim Router for the spindle?' thead:
http://www.shapeoko.com/forum/viewtopic.php?f=8&t=27
sea2stars wrote:
A speed controller would be a good idea. Any suggestions on a make/model?
Unfortunately, no. Hopefuly someone can chime in with an inexpensive option to play with; Amazon, Harbor Freight, etc.

I came across this which would be fun to play with, but perhaps overkill for the Dewalt.
minorthreat wrote:At 155$ The super PID seems hard to justify.

You could just pick up one of these http://www.amazon.com/MLCS-9410-20-Amp- ... m_sbs_hi_2 and control the knob with a hobby servo... Ghetto, yes. Cheap (comment from alpha: this is $34.94), also yes.
My first question is would it be possible to use this http://www.amazon.com/gp/product/B005K2IXHU $11.50 25A SSR with heat sink (or without for $8.50 http://www.amazon.com/25A-DC-AC-Solid-S ... ref=sr_1_2) and a PWM signal from the Arduino to change the speed of any AC powered tool? What do you think?

minorthreat
Posts: 43
Joined: Tue Apr 24, 2012 4:34 pm
Location: Boston, Ma

Re: Router Speed Controller

Post by minorthreat » Mon May 07, 2012 9:34 pm

Unfortunately AC motor control doesn't quite work like that, unless you implement some form of phase angle control. This is because of AC's time component, A chopped up dc signal averages to a constant voltage, but a similarly chopped up AC signal (with no phase reference) is just a mess of random voltages.

It could be a fun project to research and build a phased controlled SSR, but it might be easier to find a signal phase fan speed controller or something like that.

sea2stars
Posts: 93
Joined: Mon Apr 09, 2012 9:54 pm
Location: Cromwell, CT

Re: Router Speed Controller

Post by sea2stars » Tue May 08, 2012 12:41 am

grbl won't do spindle RPM control ATM, and as mentioned AC motor control isn't quite that simple; also probably not inexpensive... or safe if done improperly.

It will, if I had read more of the thread which also mentioned the SuperPID, do on/off control which could easily be controlled by an arduino and relay; easy DIY or retail.

How about a basic router speed controller with reference RPMs indicated on the dial, after measuring them with an optical laser tachometer...? Cheap and easy.

CptanPanic
Posts: 98
Joined: Tue Apr 10, 2012 3:14 pm

Re: Router Speed Controller

Post by CptanPanic » Tue May 08, 2012 10:48 am

The problem with just a standard router speed control is the slower the rpm, the less torque you have. It would be cool if someone would come up with an open source superpid.

sea2stars
Posts: 93
Joined: Mon Apr 09, 2012 9:54 pm
Location: Cromwell, CT

Re: Router Speed Controller

Post by sea2stars » Tue May 08, 2012 2:11 pm

Hrm. Would this be a better option?

Or possibly a used variac?

CptanPanic
Posts: 98
Joined: Tue Apr 10, 2012 3:14 pm

Router Speed Controller

Post by CptanPanic » Tue May 08, 2012 4:51 pm

sea2stars wrote:Hrm. Would this be a better option?

Or possibly a used variac?
that looks very interesting. Not much details on the page as to how you actually control it. If it can be controlled digitally it would be great.

sea2stars
Posts: 93
Joined: Mon Apr 09, 2012 9:54 pm
Location: Cromwell, CT

Re: Router Speed Controller

Post by sea2stars » Tue May 08, 2012 5:07 pm

Looks like a pot on the end in the image.

Yeah.. here's an assembly manual.

minorthreat
Posts: 43
Joined: Tue Apr 24, 2012 4:34 pm
Location: Boston, Ma

Re: Router Speed Controller

Post by minorthreat » Tue May 08, 2012 6:57 pm

Yup, There's a pot on the high side T2. This is a nice little router control kit, too bad it's not OSHW.

CptanPanic
Posts: 98
Joined: Tue Apr 10, 2012 3:14 pm

Router Speed Controller

Post by CptanPanic » Tue May 08, 2012 6:59 pm

minorthreat wrote:Yup, There's a pot on the high side T2. This is a nice little router control kit, too bad it's not OSHW.
Exactly.

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