Table saw motor not going g up and down

[Ronell]

I Surely hope someone here can help me out. I have a Makita Mlt100 table saw. Yesterday after I made a zero clearance insert plate and wound the blade down it doesn't want to go back up. The handle turns in both directions but nothing Happens, and there doesn't seem to be anything wrong with the threaded bar when I turned it upside down. When I turn the handle the rod turns. What could be wrong???

 

[SteveF]

have u removed the insert and see if it moves ?

Steve

 

[Ronell]

Yes I did and it's not moving

 

[Setch]

Sounds like the bar is fine, but whatever it normally engages in had come off the end - can you manually raise the assembly whilst turning the handle and see if it re-engages?

 

[ColeyS1]

Was it wound down so much that perhaps the threaded bars not connected to anything ? If the threaded bars turning, there must be a nut somewhere in the mix that causes it to rise.

Coley

 

[Ronell]

I think that maybe something got unhooked somewhere. I don't know much about the mechanical stuff so I'm a bit afraid to open the saw where the rod goes through a metal plate

 

[Lons]

I had that problem last year with my SIP cast iron saw but could tell what was wrong as it was clearly slipping. The worm mechanism which engages on the threaded rod was worn and I had to get a new one.

Don't know if yours is similar but you should also check that all the moving parts are free of gunge and lubricated, mine had regularly stood for a few weeks between use and seized up which put strain on the rise and fall mechanism.

 

[Ronell]

I will let my hubby take a look this weekend. The gears at the bottom looked fine, so Im hoping that it's only something that came loose at the motor

 

[Ronell]

Ok it seems my problem is bigger than I thought.... I took the saw apart yesterday and it seems that on some or other way the bracket that makes part of the motor housing is stripped inside where the threaded rod passes through. We'll then I'm just going to make myself a home made table saw using a circular saw until I can get mine fixed.

 

[Lons]

Ok it seems my problem is bigger than I thought.... I took the saw apart yesterday and it seems that on some or other way the bracket that makes part of the motor housing is stripped inside where the threaded rod passes through. We'll then I'm just going to make myself a home made table saw using a circular saw until I can get mine fixed.

You should be able to get the part without too much difficulty and likely not too expensive either.
As I said, check all the other moving parts are well lubricated and freely moving. The reason mine stripped was because the upper joints had seized.

Bob

 

[Ronell]

Thank you Bob I will look into it.

 

[Kim R Martins]

I have an MTL 100 and this happened to me today, this table saw has the threads for the blade lifter tapped directly into the aluminium frame that holds the motor, which even if you treat the saw really well it wears out really quickly, definitely a design flaw. There are some possible fixes:
1st- most obvious one, to replace the whole aluminium carriage frame with a new factory piece, which will worn out really quickly again.
2nd- Braze an aluminium rod into the hole and re- thread the hole, the wormscrew is a regular bolt thread so it should be easy to install.
3rd- I suggest substituting the thread with a steel nut insert, and two steel plates screwed to the side of the frame to hold the nut in place, it should make stronger than the original table saw design.