Saw auto off switch

[Thrashsmith]

I'd like to find another of these switches, ideally the same model/unit but I don't know what they're generically called, can anyone help?
It's a sprung switch that that turns off a saw when the arm has completed the cut.
Thanks in advance.

 

[brightspark]

its a Honeywell but burgess make them as well called a microswitch

 

[WorkshopChris]

You are looking for Limit Switch

A possible is
https://sensing.honeywell.com/switches/specialty-limit-switches/BZG-BZH-series
can you read the info on the switch,.

 

[Thrashsmith]

You are looking for Limit Switch

A possible is
https://sensing.honeywell.com/switches/specialty-limit-switches/BZG-BZH-series
can you read the info on the switch,.

Annoyingly I can't make out a part number, just some bits of half scuffed up info saying something like "15A 125 250 or 480 VAC, and then A250 VDG" underneath...?
Mean anything to you? It's 3phase.

 

[WorkshopChris]

The switch will probably just be an NC contact forming part of the contactor latching circuit to the start/stop switch.
You should be able to swap with almost any industrial limit switch, there are lots of mounting and plunger orientations available.
https://uk.rs-online.com/web/c/automation-control-gear/industrial-switches/limit-switches/?sra=p

 

[Fazerruss]

You can make pretty much any brand of limit switch work. I got a generic one off ebay and made a new plate to compensate for the miss match holes.

 

[Alan Reynolds]

https://www.ibhs.co.uk/omron-ze-n-2g-limit-switch.html

 

[Fazerruss]

https://www.ibhs.co.uk/omron-ze-n-2g-limit-switch.html

£46

I spent less than a tenner on mine. Then again I'm from Yorkshire

 

[brightspark]

£46

I spent less than a tenner on mine. Then again I'm from Yorkshire

Christ id want the saw for that price I just put my stop switch in a 3x3 metal box and mounted it to the saw I have

 

[Thrashsmith]

I don't want to clog up the forum with another thread so will ask in here as it's all related...
I want to replace one of the V belts as it's looking a bit tired.
Do I undo this to get the belt off/on? Or am I meant to undo something elsewhere & slide things around to loosen tension? This bit had a little screw cap on.
Thanks in advance.

 

[slim_boy_fat]

I'd be very surprised if there's not a means of slackening the belt tension without having to remove the actual pulley. What's the application and what's lurking at the upper end of that belt?

 

[WorkshopChris]

Not having seen this saw I would imagine its a case of sliding the motor forward to slacken the first belt, allowing the idling shaft adjusters to move allowing your belt to be removed.

 

[Hopefuldave]

Was the little screwed-on cap full of old grease? If so, it's probably a grease cup for the idler shaft bearings, clean it out (and the end of the shaft off) and fill it with fresh grease, smother the end of the shaft with more, then screw it back on to force grease through and into the bearings.

Cheapest probably-suitable-with-a-mounting-plate switch on EvilBay: https://www.ebay.co.uk/itm/TM-1308-...833956?hash=item4d655950a4:g:SGQAAOSwDC1Z4l0H

Note this is only 6 amp rated, but if the saw has a no-volt release switch the limit switch is usually in to coil circuit and only has less than a half-amp going through it?

Dave H. (the other one)

 

[Screwdriver]

Agree that 6A item really ought to do the job. These things do have a NVR main switch so the limit switch only has to cut power to the current holding the switch on. They are also known as push to break switches if that helps.

Re: the mystery pulley. You shouldn't have to pull the wheel off the shaft, there must be a tensioning system somewhere. Pulley wheels like that can be a complete mare to get off a shaft and require heat and a dedicated screw puller to remove.