Bridge Slotting Fixture

Moderators: kiwigeo, Jeremy D

Post Reply
User avatar
woodrat
Blackwood
Posts: 1157
Joined: Tue Nov 25, 2008 6:31 am
Location: Hastings River, NSW.
Contact:

Bridge Slotting Fixture

Post by woodrat » Thu Jun 14, 2012 10:53 am

Hi All, This is fairly self explanatory with the pics but I thought that I would show the luthier brethren here as it may be useful to someone. It is basically a wall to slide down to keep it true to the vertical axis. A set of stops controls the length of the slot and a wedge secures it tightly. I put a shim under the bridge to angle it back ~10 degrees from vertical to give a slight back slant to the saddle. The trimmer base is secured by screws to a piece of aluminium angle to register on the "wall" of the jig.
Anyway I hope that it is useful to someone....I find that it works well for me.

John the Woodrat :)
Attachments
Jig 2.jpg
Jig.jpg
"It's never too late to be what you might have been " - George Eliot

User avatar
EricDownunder
Blackwood
Posts: 175
Joined: Wed Apr 18, 2012 12:59 pm
Location: East Kurrajong, NSW

Re: Bridge Slotting Fixture

Post by EricDownunder » Fri Jun 15, 2012 11:22 am

I like that simple and effective
Keep Smiling,
Eric Smith

User avatar
woodrat
Blackwood
Posts: 1157
Joined: Tue Nov 25, 2008 6:31 am
Location: Hastings River, NSW.
Contact:

Re: Bridge Slotting Fixture

Post by woodrat » Fri Jun 15, 2012 4:45 pm

Yes Eric, The "wall" is nice and high and the 100 x 100 al"oo"minum angle is large enough to give a nice feeling of control as you plunge the trimmer. Yes simple is good!

John
"It's never too late to be what you might have been " - George Eliot

User avatar
woodrat
Blackwood
Posts: 1157
Joined: Tue Nov 25, 2008 6:31 am
Location: Hastings River, NSW.
Contact:

Re: Bridge Slotting Fixture

Post by woodrat » Thu Jun 21, 2012 7:40 am

I have just made a variation of this jig to be able to slot on the guitar. The "wall" makes the whole thing very controllable as the vertical axis is easy to control and you know you are not going to tip it at entry. I made the jig to do the on instrument slotting for my first attempt at nut and saddle compensation. I didnt use stops this time just white lines on the bridge. The two battens are to stiffen up the whole arrangement so it will span the length of the guitar. There would be a couple of degrees of back slant to the saddle as well as the jig sits on the end of the fingerboard and is clamped there.
Again I hope this is useful to somebody.....:)

John
IMG070a.jpg
IMG068a.jpg
IMG073a.jpg
"It's never too late to be what you might have been " - George Eliot

User avatar
Nick
Blackwood
Posts: 3647
Joined: Thu Feb 26, 2009 11:20 am
Location: Christchurch, New Zealand
Contact:

Re: Bridge Slotting Fixture

Post by Nick » Thu Jun 21, 2012 8:39 am

I see this very nice easy setup is for an uncompensated saddle John, if you need compensation do you swivel the whole jig or will you have a seperate jig with slanted guides, and what sets the slot length, does the Aluminium angle on your router run into the two uprights or do you rely on eyeball stops?
"Jesus Loves You."
Nice to hear in church but not in a Mexican prison.

User avatar
woodrat
Blackwood
Posts: 1157
Joined: Tue Nov 25, 2008 6:31 am
Location: Hastings River, NSW.
Contact:

Re: Bridge Slotting Fixture

Post by woodrat » Thu Jun 21, 2012 9:19 am

Hi Nick...you can do either...I am just having a go at my first nut and saddle compensation guitar hence no angle on the jig. On my other jig....the one I posted first...I rout the slot off the instrument...it has compensation angle built in as this is for saddle only compensation...I have stops on that one. I didnt put stops on the on instrument one and found it easy to work to a couple of white pencil lines. My router has LED lights too which makes that easier.

John
"It's never too late to be what you might have been " - George Eliot

User avatar
woodrat
Blackwood
Posts: 1157
Joined: Tue Nov 25, 2008 6:31 am
Location: Hastings River, NSW.
Contact:

Re: Bridge Slotting Fixture

Post by woodrat » Thu Jun 21, 2012 10:35 am

....Nick, this set up is actually for a compensated saddle but it is as per the Trevor Gore/Gerard Gilet book. The compensation is over a 5mm wide saddle instead of a slanted skinny one.
"It's never too late to be what you might have been " - George Eliot

User avatar
Nick
Blackwood
Posts: 3647
Joined: Thu Feb 26, 2009 11:20 am
Location: Christchurch, New Zealand
Contact:

Re: Bridge Slotting Fixture

Post by Nick » Thu Jun 21, 2012 11:47 am

woodrat wrote:....Nick, this set up is actually for a compensated saddle but it is as per the Trevor Gore/Gerard Gilet book. The compensation is over a 5mm wide saddle instead of a slanted skinny one.
Thanks John for explaining :wink: I still use a 5mm saddle even compensated, I use the Somogyi idea (although I'm not sure he's the one that originated it, I just saw him use it so associate it with him) of a decent radius behind the string break point so the string 'rolls' off the saddle.
"Jesus Loves You."
Nice to hear in church but not in a Mexican prison.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest