Jig for slotted backs.

[planemaker]

A newly designed jig for resizing the slot on my backsaw hardbacks.

*Do not attempt this without the correct safe guards in place.*

The jig is 12 inches in length.

Stewie;

http://i1009.photobucket.com/albums/af219/swagman001/slitting%20jig/_DSC0069_zpsd5a8swhu.jpg (http://s1009.photobucket.com/user/swagman001/media/slitting%20jig/_DSC0069_zpsd5a8swhu.jpg.html)

http://i1009.photobucket.com/albums/af219/swagman001/slitting%20jig/_DSC0068_zpskwopx84p.jpg (http://s1009.photobucket.com/user/swagman001/media/slitting%20jig/_DSC0068_zpskwopx84p.jpg.html)

[Simplicity]

Stewie ,
Question what kind of slitting arbour are you using ?
Also have you considered mounting the jig to a piece of mdf particle board say 300/300 mm .
On one edge bolted down or use toggle clamps ,then placing some handles on the other side to use to guide it .
I'm saying this as I had a near miss 12 months ago ,and it shook me a bit I still carry the scar .
Matt

[planemaker]

Hi Matt. The slitting saw arbor I use accepts different types of ID. I have 2 raised knobs on order that will be fitted to this jig. As I mentioned there needs to be a number of safe guards that need to be in place before you should attempt to use a router table to slot the brass backs. Router speed & maximum OD of the slitting blade are only 2 of these safe guards. I personally feel much safer now doing this task; than I do at any time cutting timber to rough dimension on my bandsaw.There exist a risk with any powered tool; it a matter of identifying what those risks are, then taking the appropriate steps to reduce its potential to cause any injury. IMO

regards Stewie;

[Simplicity]

Thanks Stewie
I should of been more specific I was after the brand name of the slitting saw arbour
Matt

[planemaker]

Thanks Stewie
I should of been more specific I was after the brand name of the slitting saw arbour
Matt


Hi Matt. I sent you a pm with a link to the arbor.

regards Stewie;

[Simplicity]

Thanks Stewie

[rob streeper]

Stewie,

That thing looks hungry.

Regards,
Rob

[planemaker]

Stewie,

That thing looks hungry.

Regards,
Rob

Hi Rob. Whats not shown within the photo's is an outboard fence that I use to control the depth of cut. It usually takes me 5 - 6 passes to reach full depth of slot.

regards Stewie;

[RayG]

Hi Stewie,

A couple of hints that might help, using a climb cut will track straighter, don't use coolant, it warps the blade on deeper cuts. Feed rate is very important, it takes practice on the mill, but I cut full depth in one pass, but very slow feed.

Getting the surfaces of the clamping setup flat and square to the cutter axis is going to be a tricky job, but with practice, and allowing for scrap parts, you will get there.

Ray

[planemaker]

Thanks Ray. Appreciate the feedback.

Stewie;

[planemaker]

1st run using the new jig assembly. The newly cut slot is for 0.025 saw plate gauge. You will note outboard fence in place that controls the depth of cut. 3 full passes were taken to reach the required depth of slot.

http://i1009.photobucket.com/albums/af219/swagman001/slitting%20jig/_DSC0070_zps3mz7219v.jpg (http://s1009.photobucket.com/user/swagman001/media/slitting%20jig/_DSC0070_zps3mz7219v.jpg.html)

The new slot is parallel in both axis. No apparent heat build up or vibration was observed during the test.

http://i1009.photobucket.com/albums/af219/swagman001/slitting%20jig/_DSC0072_zpsjyouaagw.jpg (http://s1009.photobucket.com/user/swagman001/media/slitting%20jig/_DSC0072_zpsjyouaagw.jpg.html)

I did notice within this 2nd photo a false impression that the front 1 1/2" looks slightly wider than the rest of the slot . That is not the actual case. That slot is perfect in width and depth along the brass backs full length.

Note: I have 2 round handles (currently on order) that will be fitted to the top of the jig when they arrive.

regards Stewie;