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Shop built bandsaw blade sharpener

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Project by Div posted 1435 days ago 11417 views 11 times favorited 19 comments Add to Favorites Watch

I promised some people that I will post this contraption, so here it is. It is a shop built sharpener for the band saw blades I use on my sawmill. The blades I use are 32mm wide with a 22mm pitch.

The machine was built with mild steel off cuts from the scrap bin. I have a metal lathe and could make the machined pieces but these are not many. I found the grinder motor at a junk yard and modified the shaft to accept the grinding wheel. The feed motor is a 12 volt wiper motor from a car. Now I can’t drive my truck when it is raining…

It took me quite a few evenings to figure the mechanisms! I ended up building a mock up in timber to confirm and refine the mechanisms. The hardest part was establishing the correct shape for the cam. This determines the “path” of the grinder wheel over the blade.

I’ll try and explain the operation: The feed motor advances the blade via that threaded rod thing that goes through the aluminum block. There is a fork at the end of the rod with a pin through. This catches on a tooth, advances the blade a certain amount, then returns to catch and advance again. At the same time and in sequence with the advancement, the cam causes the grinder motor to move in such a way that it follows the profile of the tooth. Thus it grinds the tooth evenly along its shape. The height of the grinding wheel above the blade can be adjusted by the knurled wooden knob. This determines the amount of grind along the top of the tooth. The length of the forked rod can also be adjusted. This sets the amount of grind along the vertical of the tooth.

I hope all that makes sense…

A tank underneath the machine contains water which is pumped with a tiny aquarium pump onto the blade as coolant. Therefore the 3 switches: one for feed, one for grinder, one for coolant pump.

The machine works a treat and I have used it for years. I get supersharp blades that let me mill 3mm veneers. If like me, your wallet is thin, build your own!

-- Div @ the bottom end of Africa. "A woodworker's sharpest tool should be his mind."





19 comments so far

View mafe's profile

mafe

9456 posts in 1692 days


#1 posted 1435 days ago

Wauuu, I’m really impressed my dear Div.
You are such a inventor. Not only do you construct your own sawmill, you also create a shapening machine for it! I guess living where you do makes it even needed.
Best thoughts,
Mads

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1718 days


#2 posted 1435 days ago

yep impressive people there is here Mads …......LOL..don´t be so modest Mads
it´s amasing so many there is that have theese kind of skills to build there own maschines

well done Div. you have many creative talents :-)

take care
Dennis

View rance's profile

rance

4125 posts in 1763 days


#3 posted 1435 days ago

Now a video of that running would be as slick as greased owl snot on a brass door knob.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View jackass's profile

jackass

350 posts in 2315 days


#4 posted 1435 days ago

What Rance said times 100.
Jack

-- Jack Keefe Shediac NB Canada

View Div's profile

Div

1653 posts in 1543 days


#5 posted 1435 days ago

mafethanks brother! These things are available here, IF you know the bank manager VERY well! In my case its necessity, or rather poverty, that is the mother of invention. dennis thanks, friend in the North. You are always there!

rance & jackass Sorry dudes, I live just a stone throw this side of the dark ages! No machine here that can take a video. Heck, I can’t even watch one on the Internet, my farm computer WAY to slow!

-- Div @ the bottom end of Africa. "A woodworker's sharpest tool should be his mind."

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1718 days


#6 posted 1435 days ago

where ells can I bee ..lol…. as long as my hole shop is more or less packed down
I will claim my right to the front seat and enjoy and learn as much as I can and come
with werd questions and comment those things I find interressting :-)
but when my shop is ready to be build up again I´m not so sure you will see much to me
but you know I have fun with wood….....LOL

View HalDougherty's profile

HalDougherty

1820 posts in 1839 days


#7 posted 1435 days ago

Very impressive project! How did you get the shape of the grinding wheel?

-- Hal, Tennessee http://www.first285.com

View Div's profile

Div

1653 posts in 1543 days


#8 posted 1435 days ago

Hey Hal, glad you like. The grinding wheel is only 6mm(1/4”) wide. Dress it with a diamond dresser, basically a radius on one side and bevel towards the other. Hope this can be inspiration!

-- Div @ the bottom end of Africa. "A woodworker's sharpest tool should be his mind."

View Bearpie's profile

Bearpie

2584 posts in 1620 days


#9 posted 1435 days ago

Nice work there, Div. I’m impressed with your ingenuity to make do and to make things to help you work more efficiently. I would say that 98 percent of us could not make something like this, but would go out and purchase it. Maybe if we had the plans, some of us could but I doubt from scratch.

Erwin, Jacksonville, FL

-- Erwin, Jacksonville, FL

View RonPeters's profile

RonPeters

708 posts in 1483 days


#10 posted 1435 days ago

Impressive! How fast is it?

Someone once said to me, “Who taught the inventor?”

That saying should be posted in every school room across the country, as well as my sig….

-- “Once more unto the breach, dear friends...” Henry V - Act III, Scene I

View mafe's profile

mafe

9456 posts in 1692 days


#11 posted 1435 days ago

Div,
If you can’t make a videocam yourself, then I’m a little dissapointed now…
Laugh!
Your brother Mads

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View dustyal's profile

dustyal

1195 posts in 2078 days


#12 posted 1434 days ago

I vote with everyone else… a video is now mandatory! Very clever. copyright applied for?

-- Al H. - small shop, small projects...

View docholladay's profile

docholladay

1286 posts in 1661 days


#13 posted 1434 days ago

I like it. You have made something useful out of what might have otherwise been a bunch of junk. Very very cool.

-- Hey, woodworking ain't brain surgery. Just do something and keep trying till you get it. Doc

View lightweightladylefty's profile

lightweightladylefty

2594 posts in 2315 days


#14 posted 1434 days ago

Div,

This is absolutely brilliant. We’ll show it to our sawyer who has “customized” his mill with many bells and whistles. He’s pretty mechanically minded, but we’re not certain if he’s this talented!

L/W

-- Jesus is the ONLY reason for ANY season.

View Cher's profile

Cher

934 posts in 1696 days


#15 posted 1434 days ago

Div, I am impressed, you are very clever.
I suppose the saying ” ‘n boer maak ‘n plan” applies.

Thanks for sharing Div.

-- When you know better you do better.

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