Re: [TCML] Slide choke question

[Quarkster <quarkster@xxxxxxx>]

This type of adjustment is very commonly used on various types of woodworking and shop clamps. Basically, one or more more spring-loaded metal plates "bind" or "wedge" against the clamp rail to lock one of the clamp jaws in place.
   
  A very good illustration of this styyle of lock mechanism can be seen at the Rockler Tool site: http://www.rockler.com/product.cfm?page=16742 (Click "View Larger Image" for better detail).
   
  Regards,
  Herr Zapp
   
   
  Sfxneon@xxxxxxx wrote:
  In a message dated 7/22/2008 7:06:31 P.M. Central Daylight Time, 
_aesops.tech@xxxxxxxxxx (mailto:aesops.tech@xxxxxxxxx) writes:

<< I for one am very interested, to learn how this is accomplished.
Thanks >>


Okay, a square metal plate with a square hole (looking something like a big 
square washer) is hinged on one side and attached at the front of the coil 
form, so that the choke core slides in and out of the coil form, and through 
the square hinged plate on front. A spring is attached to the square plate 
opposite the hinge, which pulls one side of the plate towards the choke coil. 
This allows the core to be pulled out, but puts it in a bind when it tries to 
pull itself back in. This allows you to ramp and hold a setting when it is 
reached. To return the choke core back to it's full in position, the plate is 
pulled forward against the spring tension, removing the bind on the core and 
allowing it to be pushed back in.

A couple of VERY important things to remember, if you do this, is to cut a 
slot in the square metal "washer" that goes from the outside edge to the inside 
hole. If you don't do this, it will become a one turn shorted secondary 
winding around the core, which could induce hundreds of amps into it, make it 
very hot, and waste a lot of power. Also, if you plan to attach a metal handle 
on the front of the core, don't make it a continuous loop. Bombarder choke 
handles are made of wood, and attached with two brackets to the core. 

Some folks have also attached a linear actuator to the core so that the 
current can be controlled by UP and DOWN buttons. 

Tony Greer
*************

On Tue, Jul 22, 2008 at 2:54 PM, wrote:

> Hey Bama,
> 
> Also, bombarder chokes usually have a very simple mechanism that allows the
> choke to only be pulled out (until it's released), which holds it in
> position
> when you let go. Otherwise, you are fighting the pull of one very big
> solenoid! I'll explain it if anyone is interested.
>
> Tony Greer
> *************





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