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Thread: Bandsaw ‘ripples’
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26th October 2021, 02:12 PM #1Member
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Bandsaw ‘ripples’
Hi, my first question 😄
I have a 12” bandsaw. it rips straight.. i.e no drift. New-ish decent blade.
However, the edges of my rips have uniform ripples along the entire edge. I can plane these off of course but am somewhat frustrated that i can’t get a smoother cut; not finished quality, but something that is better than i am getting.
As i said, no drift, but are these ripples caused by a tension issue, a feed speed issue or something I haven’t considered? I have tried adjusting tension and feed speed a little but to no avail.
Timber used to date, pine, marri, sheoak, mdf(!)…
Any pointers will be appreciated
Thanks
Cheers
Mal
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26th October 2021 02:12 PM # ADSGoogle Adsense Advertisement
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26th October 2021, 02:28 PM #2.
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Whoops, I just realised you are a newbie and can't post pics yet.
We really need to see some pics.
Could be one or more teeth has more set that the others.
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27th October 2021, 06:10 AM #3Senior Member
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I'd have guessed the MDF would have sorted out the set, and also blunted the blade quite severely,
not that I have ever cut it on a bandsaw.
It sounds strange to me, not hearing of drift on a 12" machine, these must be small pieces you are cutting?
Is it spelching from the underside that you are having issue with?
If so, we need piccys of the cut quality from both sides of the blade, which would indicate set issues, or maybe setup issues, but it sounds like you've got it sorted, if you're using the fence and have surfaced timbers, and not using it freehand using a point fence.
Tension could be an issue, and if so could likely be where the machine is going to show it's limitations.
Sounds interesting
Tom
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27th October 2021, 07:47 AM #4
Hi Mal,
I have seen this before with my 1" blade (which is really too big for my saw). In my case the blade tensions wasn't sufficient.
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27th October 2021, 01:59 PM #5SENIOR MEMBER
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Could be a tension problem. There are some good videos on youtube covering tension including looking out for blade 'flutter' as a guide for tension. Basically you tension up until the first signs of flutter. If the blade starts fluttering back the tension off a 1/4 turn and see how it goes.
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27th October 2021, 08:02 PM #6GOLD MEMBER
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All bandsaws do this, they are for rapid deep ripping of stock, not for finish cutting. That’s why we have planers and jointers in a workshop.
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27th October 2021, 09:13 PM #7Member
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Ok firstly I need to correct myself, it is a 14" Sherwood Standard bandsaw with a 7tpi blade (I munted the stock blade that came with the saw) - pretty new - not done a lot of hard timber to date, mostly pine, some beech and MDF (!)
Firstly edge of 6mm MDF...
..then 12mm lump of Tas Oak
this one is SheOak but fed in glacially slow - some improvement - probably liveable on short rips but long rips would mean my coffee gets cold
This is the blade - looks clean - feels sharp...
this last one shows very little, if any, drift - which is good
So i think for this blade a really slow feed might be what I need. any other thoughts ? particularly for long rips (i.e for future table legs) - smaller blade maybe? 3-4TPI ??
Cheers
Mal
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27th October 2021, 09:15 PM #8
Possibly the machine frame is just not strong enough and basically detensions the blade
as your cutting.
H.
Please ignore this I was replying to your post of it being a 12” Saw.
Bit slow, sorry.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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27th October 2021, 09:21 PM #9Member
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Thanks riverbuilder.
Indeed I don't expect a finish cut but on the stock 4TPI blade that came with the saw I wasn't getting these ripples - finish was much smoother and a light tickle with a plane sorted it out. I munted the stock blade (too many tight curves for the width of the blade!) so bought this one... maybe it was the MDF that blunted this blade somewhat that someone else mentioned..mmm....
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27th October 2021, 09:24 PM #10GOLD MEMBER
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That does look like a fairly wide blade for a 14" saw. I have an older Carbatec 18" saw with a 1" wide 1.25 tpi (?) carbide tipped blade that also shows the ripple effect, it is hardly noticeably sometimes but worse on some timbers. As Riverbuilder says that's why we have jointers, thicknessers and drum sanders.
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28th October 2021, 09:53 AM #11.
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Those ripples look normal to me. With a 7 tpi blade I wouldn’t expect fast cutting. A 3-4 tpi should be considerably faster.
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28th October 2021, 10:59 AM #12SENIOR MEMBER
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Rule of thumb, less teeth, fast cut, rough finish. More teeth, slower cut, finer finish. Applies to any cutting instrument with teeth.
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28th October 2021, 05:07 PM #13Senior Member
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I have bought the same bandsaw and asked the same question
I think its the nature of the beast, plenty of sanding etc to get the desired finish
I'm going to try a bi metal blade soon, so far I have a starrett 4 TPI fitted which is ok
I will say tho : the cut is nice and straight when resawing
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28th October 2021, 11:14 PM #14
From your photos it seems to be cutting nicely however I suspect that your blade has some quality issues with the set of the teeth.
Mobyturns
In An Instant Your Life CanChange Forever
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30th October 2021, 12:50 PM #15Member
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