Just finished this bandsaw blade jig this afternoon. I still need to build a jig that will grind both sides of a blade at the same angle for silver brazing.
tackit, proud to be a member of MetalworkingFun Forum since May 2014.
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Bandsaw Blade Repair Jig
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06-04-2014, 03:19 AM
Hi Tackit, looks like a nice job there, this is an item I intend to make at some point, its on my long ' to do' list
 cheers Mick
Micktoon, proud to be a member of MetalworkingFun since Sep 2012.
06-04-2014, 05:16 AM
(06-04-2014, 03:19 AM)Micktoon Wrote: Hi Tackit, looks like a nice job there, this is an item I intend to make at some point, its on my long ' to do' list It's taken quite a long time for me to get the lead out and build one too Mick. I'm going to build a jig that goes with it that holds the two ends of the blade and grinds them both to the same angle so the blade doesn't have a hump in it after brazing. I'm going to investigate and see if I can find out what angle blade repair companies use. I don't possess the ability to eyeball the angle close enough to make a perfect fit up. 
tackit, proud to be a member of MetalworkingFun Forum since May 2014.
06-04-2014, 05:45 AM
Didn't Tom have a few posts of his blade welding jig that incorporated angled slot(s) on the rear to facilitate grinding an equal bevel on the blade ends?
Sorry for not posting a link but I've given up on the search functions of this wonderful site.
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.
06-04-2014, 06:39 AM
(06-04-2014, 05:45 AM)stevec Wrote: Didn't Tom have a few posts of his blade welding jig that incorporated angled slot(s) on the rear to facilitate grinding an equal bevel on the blade ends? Yes Tom did incorperate a slot on his jig. 20° is the correct angle. I built Tom's version on 1/2" aly plate and it works great! His build is here: http://www.metalworkingfun.com/showthread.php?tid=1975 Chuck
Micromark 7x14 Lathe, X2 Mill , old Green 4x6 bandsaw
The difficult takes me a while, the impossible takes a little longer.
06-04-2014, 07:50 AM
Guys I see the blade slot but how does Tom cut the slot to an even depth across the jig? The slot just a little off would cause the blade to grind at an angle. My blade is 1" wide so I would think I would need a tight slot 1/2" deep to get a even 20 degree grind on both sides..
tackit, proud to be a member of MetalworkingFun Forum since May 2014.
I'm pretty sure Tom did a video of it in action, in which he covers the whole process.
I'd also look at something more flame retardant than the toilet roll holder or you might find the jig moves significantly when you are silver soldering the blade
Hunting American dentists since 2015.
06-04-2014, 08:21 AM
For wider blades like that, I would just add a couple of 3/4" bars on top of the fixture to create the slot. The screw holes holding them down could even be slotted so the width of the slot could be adjusted for various thickness blades. My fixture also has a key on the bottom so it aligns with the miter gauge slot in the belt sander. Then all I have to do is feed the blade against the belt one end at a time to grind the 20º angle. It's quick, accurate and makes a hell of a strong joint.
Tom ![[Image: TomsTechLogo-Profile.png]](http://tomstechniques.com/wp-content/uploads/2013/11/TomsTechLogo-Profile.png) (06-04-2014, 08:21 AM)TomG Wrote: For wider blades like that, I would just add a couple of 3/4" bars on top of the fixture to create the slot. The screw holes holding them down could even be slotted so the width of the slot could be adjusted for various thickness blades. My fixture also has a key on the bottom so it aligns with the miter gauge slot in the belt sander. Then all I have to do is feed the blade against the belt one end at a time to grind the 20º angle. It's quick, accurate and makes a hell of a strong joint. Tom My 12" sander's disc is to far away from the tables slot to work like yours. I'm going to have to build another jig just for grinding blades. I have a piece of of 1" square stock I'm going to drill holes in to except three 3/4" diameter X 1/2" deep barrel neodymium magnets that should hold the blade to the 1" steel, which will be clamped and silver soldered to the grinding jig's base at 20 degrees. I'll have to make an attachment for the jig that's long enough it allows the blade to reach the 12" sanding disc and ride in the table's slot. Tom I got this idea from watching your video. I plan on educating myself as the days go by by watching more of your videos and reading your posts, I'm sure I will become a better hobbiest by listening to what you have to say. Thanks 
tackit, proud to be a member of MetalworkingFun Forum since May 2014.
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