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17th February 2023, 11:10 AM #1Senior Member
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What am I doing wrong? And what are these “pockmarks” called?
Got a sherwood 13” thicknesser with spiral head.
Feeding some pine through and getting these weird marks/divots. I’m taking approx 2mm off.
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17th February 2023 11:10 AM # ADSGoogle Adsense Advertisement
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17th February 2023, 11:15 AM #2Senior Member
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I don’t have a thicknesser but that looks like tear out. Is 2mm too much in one pass, sounds like a lot, I doubt any of my hand planes would take that much cleanly. I have a makita hand plane if I set it to 3 or 4 mm it will chop away merrily all day and then I will have to clean up the face…..lots
cheers
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17th February 2023, 11:20 AM #3
Yes thats tear out. Check the grain direction. Make sure you are cutting with the grain, not against it and reduce the depth of cut.
Those were the droids I was looking for.
https://autoblastgates.com.au
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17th February 2023, 01:46 PM #4Senior Member
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Yeah I noticed it was on grain direction changes. So agree probably tear out. What’s a good cut depth? 1mm? Or depends on the situation?
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17th February 2023, 01:58 PM #5GOLD MEMBER
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Looks more like the result of poor chip/dust extraction. The chips wrap around the head and then get pressed into the face of the board by the cutters.
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17th February 2023, 02:06 PM #6
It can also be bruising, caused by the chips not being cleared fast enough then clogging the cutters. The helical head can trap chips between the carbide inserts, or under them, then compressing the chip into the wood.
It is imperative that you have good chip / dust collection and an adequate capacity with your dust collector.
ps it can also be chips trapped between the work piece and the base of the thicknesser.Mobyturns
In An Instant Your Life CanChange Forever
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17th February 2023, 02:13 PM #7
I have exactly the same machine. Yes grain direction is important if taking a lot off in one pass but not critical if <1mm.
I just did +50Lm construction grade pine for exposed rafters and 1mm of cut without bothering with grain direction and it came out good enough to stain and polish but this was being painted.
It is important to have good chip extraction. I got an Aldi dust extractor for using on site (made by Scheppach) which was on sale around Christmas new year and it is fantastic when used in combination with the thickyThe person who never made a mistake never made anything
Cheers
Ray
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17th February 2023, 03:09 PM #8Senior Member
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Ok well the potential it was bruising made me check and…..I’m embarrassed to say now.
I was ripping very thin strips off earlier using a tapering jig just to get a straight edge. Well, upon looking at the intake of the dusty (where it goes into the impeller housing, there were a bunch of those thin strips that had gotten caught and basically clogged the whole thing up.
I’ll be running pieces through the thicknesser again next weekend so will confirm that is the issue. But I’m going to assume so. Bloody hell…. Good thing this is all for a workbench so aesthetics are not a factor for me.
Thanks everyone
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18th February 2023, 07:56 AM #9SENIOR MEMBER
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I'm with the previous poster in my experience as a wood machinist it looks like the chip extraction is not up to the job.
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18th February 2023, 01:40 PM #10
I have the same Thicknesser and can confirm its most likely the dust extraction as I had the exact same problem a few times with the bag filling up too quickly and blocking, that was until I upgraded to a 60l Ryobi 1400w. You will
also find it doesn't happen much on harder woods.
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18th February 2023, 02:54 PM #11
That is too symmetrical and confined for tearout. It looks like depressions in the surface of the wood. This is soft wood, and more inclined to suffer if chips are not cleared inside a thicknesser.
Regards from Perth
DerekVisit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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18th February 2023, 02:56 PM #12
I put a spiral head in my DW 735 and have noticed a bit of that on soft woods only. I thought it was tear out but it may well be bruising and the harder woods dont get affected by it. My machine has built in chip blower so now I am wondering if the dusty is actually holding up the flow a bit.
Regards
John
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20th February 2023, 09:59 PM #13Senior Member
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- Jul 2008
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