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Forum topic by Karda posted 08-03-2019 06:45 AM 626 views 0 times favorited 19 replies Add to Favorites Watch
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Karda

1843 posts in 1120 days


08-03-2019 06:45 AM

Hi, when I am cutting a bowl blank on mt bandsaw the blade slams into the wood. Sometimes it sounds and feels like shooting a machine gun. When it makes the noise I expect the blade to break


19 replies so far

View joey502's profile

joey502

558 posts in 2084 days


#1 posted 08-03-2019 07:34 AM

Is the bottom of the blank flat? If not the blade could be grabbing the wood and as the wood moves the blade is binding.

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Karda

1843 posts in 1120 days


#2 posted 08-03-2019 01:56 PM

no the surface is rough chain saw cuts and not perfectly smooth

View Jack Lewis's profile

Jack Lewis

534 posts in 1644 days


#3 posted 08-03-2019 02:23 PM

I very seldom cut a blank on the BS. Mount it on lathe, cut a tenon or mortice for chuck, reverse it and with tail stock in place use the rounding as practice cuts. Get to total experience!

-- "PLUMBER'S BUTT! Get over it, everybody has one"

View OSU55's profile

OSU55

2453 posts in 2555 days


#4 posted 08-03-2019 02:43 PM

Agree if the piece can rock on the saw table it can grab the blade. Doesnt have to be perfectly flat, but when the saw does it check for rocking of the piece.

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joey502

558 posts in 2084 days


#5 posted 08-03-2019 02:57 PM

The chainsaw cut can be good enough to finish the blank on the bandsaw but any rocking can be problematic. I use a Nova midi lathe that is most likely too small for some of the pieces i turn on it. Going straight from the chainsaw to lathe is not an option for me.

Place the best side down on the bandsaw’s table and take it somewhat slow.

A blade with fewer teeth is better, i use a 1/2” 3tpi blade. I find the blade has a harder time clearing the dust from the kerf with green wood than dry. I also get more build up on the blade with green wood.

If the chainsaw cut is too rough you can sit the blank on a sacrificial piece of plywood and use shims to correct any problems.

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Lazyman

4213 posts in 1953 days


#6 posted 08-03-2019 03:34 PM

It is very unsafe to not have a flat surface on the bandsaw top when cutting but I am not sure I buy the non-flat surface theory. Your description as a machine gun implies a pretty fast repeating sound. You would definitely feel the piece rocking if you have a repeating sound and you would be able to hold the side you are cutting against the table to make it stop (unless is is actually a curved shape). Is it possible that the sound is repeating once per revolution of the blade? Check the blade to see if it is kinked or bent, has broken teeth or a bad weld? Have you tried another blade?

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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Karda

1843 posts in 1120 days


#7 posted 08-03-2019 04:19 PM

The blade is brand new, unboxed it yesterday. I checked for bad teeth didn’t see anything. The noise isn’t constant, sometimes it smooths out.

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LesB

2244 posts in 4009 days


#8 posted 08-03-2019 05:45 PM

Are you putting the proper tension on the blade. Don’t go by any scale that is built into the saw tension setting. Use the standard blade deflection technique.

-- Les B, Oregon

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Karda

1843 posts in 1120 days


#9 posted 08-03-2019 05:54 PM

it nis not the blade, I cut the end off a 2×4 and it cut smooth as can be. I can probably up the tension some but I don’t want to get it to tight, Whats to tight

View Nubsnstubs's profile

Nubsnstubs

1635 posts in 2296 days


#10 posted 08-04-2019 02:00 PM



Hi, when I am cutting a bowl blank on mt bandsaw the blade slams into the wood. Sometimes it sounds and feels like shooting a machine gun. When it makes the noise I expect the blade to break

- Karda

Mike, have you ever fired a machine gun? If you have, thanks you for serving our country.

I don’t have any answers for your issue, but if it’s like rapid fire, it could be a pulley set screw that might have just enough tension to cut thinner stuff. When you try larger stuff, it causes the blade to intermittently stall, while the motor keeps turning. The screw hits the key in the key way, creating a condition that would make me alert and looking for a fox hole…............. Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Karda

1843 posts in 1120 days


#11 posted 08-05-2019 04:43 AM

Just an analogy Jerry I have never fired a machine gun . What should i look for, I am no machinist

View TheDane's profile

TheDane

5710 posts in 4229 days


#12 posted 08-05-2019 02:26 PM

Maybe this will help … https://youtu.be/z7n7Gg4QOkc

From the way you describe it, it sounds like the blade is binding in the cut, which happens when the workpiece is not flat on the table.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View Jack Lewis's profile

Jack Lewis

534 posts in 1644 days


#13 posted 08-05-2019 02:33 PM


I very seldom cut a blank on the BS. Mount it on lathe, cut a tenon or mortice for chuck, reverse it and with tail stock in place use the rounding as practice cuts. Get to total experience!

- Jack Lewis


I failed to mention that I use “nubsnstub” (Jerry’s) faceplate to hold the blank between centers until I have the tenon or mortise cut and the bottom partially roughed. It has adjustable points to dig in and hold the blank in position where I want to begin.

-- "PLUMBER'S BUTT! Get over it, everybody has one"

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Nubsnstubs

1635 posts in 2296 days


#14 posted 08-05-2019 02:34 PM



Just an analogy Jerry I have never fired a machine gun . What should i look for, I am no machinist

- Karda

Aw shucks, Mike. I thought you might have been a veteran. Now, just find out the size Allen wrench needed, usually 1/8’ or 5/32”. Check both pulleys. Tighten them whether loose of not. If that doesn’t work, check the back of your blade at the weld. Check your guide bearings if you have them by spinning them listening for noise. Check the surfaces of the bearings. If I have plagiarized someone else’s suggestion, my apologies. ........ Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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Karda

1843 posts in 1120 days


#15 posted 08-05-2019 03:32 PM

It shouldn’t be the blade it is brand new, I’ll tighten the pullys. I don’t see anything wrong with the lower bearings, but they don’t revolve. If I left the screw loose enough for them to revolve they would self adjust from vibration. The top bearing are unitized

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