GrampaJim Posted April 4, 2015 Report Share Posted April 4, 2015 Every time I cut oak on my saw I get black smudges next to the cut line. They come off with a fair amount of sanding, but are a pain, Other light colored woods like aspen don't have this problem. The pictures make it look like it is part of the grain, but it is not. Any advice would be most helpful. Jim Quote Link to comment Share on other sites More sharing options...
bandaideman Posted April 4, 2015 Report Share Posted April 4, 2015 My first thought before looking was blade size and speed but it does not look that there is burning on the edge cut. I have had Oak with the black strick in it like that but was part of the wood and grain not sure if environment cause or not but yes it will go down a ways. Having said that I notice this before I cut and of course stays there. I also see this more if the wood is older or moist place or cold weather. Quote Link to comment Share on other sites More sharing options...
Around the corner Posted April 4, 2015 Report Share Posted April 4, 2015 I find that rubbing parafin wax on both sides of the blade helps.Try that hope it helps! Quote Link to comment Share on other sites More sharing options...
Jim Finn Posted April 4, 2015 Report Share Posted April 4, 2015 Slower saw speed and slower feed rate may help. Quote Link to comment Share on other sites More sharing options...
amazingkevin Posted April 4, 2015 Report Share Posted April 4, 2015 Al of the above but a guess would be wood not cured enough , dull blade,Just guessing Lucky2 1 Quote Link to comment Share on other sites More sharing options...
spirithorse Posted April 4, 2015 Report Share Posted April 4, 2015 Hi, It sure doesn't look like the wood is being burned by the blade. It looks more like it is in the area of the blade holder. Have you cleaned the blade holders/blade clamps to see if they are causing the streaks?I hope you find the cause soon and share the result with us. God Bless! Spirithorse Quote Link to comment Share on other sites More sharing options...
rjR Posted April 4, 2015 Report Share Posted April 4, 2015 MY GUESS and it is a guess! Might be a track from aluminum from either table, or down-clamp! If they are aluminum try to wax the heck out of both! I had a Dremel with an aluminum table that would leave black marks on some wood if I did not keep it very well waxed. There is a cover available that is Teflon-- self adhesive and cut-able to shape. I think I even had a pop-up ad for it on this site. Quote Link to comment Share on other sites More sharing options...
ike Posted April 4, 2015 Report Share Posted April 4, 2015 If this is on oak alone and it doesn't do it on other woods the the same thickness I would try a slower speed . i have dw 788 and I run 3/4 oak at a 4 or 5 speed using a 3 5 blade IKE Quote Link to comment Share on other sites More sharing options...
Lucky2 Posted April 5, 2015 Report Share Posted April 5, 2015 It could be a small sap pocket, that burns from the heat of the blade. Len Multifasited 1 Quote Link to comment Share on other sites More sharing options...
dgman Posted April 5, 2015 Report Share Posted April 5, 2015 MY GUESS and it is a guess! Might be a track from aluminum from either table, or down-clamp!If they are aluminum try to wax the heck out of both! I had a Dremel with an aluminum table that would leave black marks on some wood if I did not keep it very well waxed.There is a cover available that is Teflon-- self adhesive and cut-able to shape. I think I even had a pop-up ad for it on this site. My feeling is track from an aluminum table also. Waxing the table should help. Quote Link to comment Share on other sites More sharing options...
LarryEA Posted April 5, 2015 Report Share Posted April 5, 2015 My guess is: the thickness of the oak... The saw blade had a logo & info on the side that is shaving off and collecting on the sides. Quote Link to comment Share on other sites More sharing options...
LarryEA Posted April 5, 2015 Report Share Posted April 5, 2015 Actually what I wanted to say is that is debris from the saw blade flaking off the side of the blade. Quote Link to comment Share on other sites More sharing options...
DWSUDEKUM Posted April 5, 2015 Report Share Posted April 5, 2015 Oak has tannin in the dark striations of the grain, when you heat it such as cutting it with a slightly duller blade the tannin will come to the surface. This is especially true as the wood has higher moisture content. Notice that it only happened close to the cut and only at the dark striations of the grain. Sharp blades, use blue tape / packing tape for the lube properties and you should not have the problem. DW Quote Link to comment Share on other sites More sharing options...
GrampaJim Posted April 5, 2015 Author Report Share Posted April 5, 2015 Thanks everyone. I have a bunch of things to try. Since my saw is a Dewalt that I have cleaned and have a fresh coat of Johnson' paste wax, that leaves out the aluminum table. Jim Quote Link to comment Share on other sites More sharing options...
KurtP Posted April 5, 2015 Report Share Posted April 5, 2015 This might not be the exact same but I was doing a lot of oak cuttings and I was getting a buildup of black stuff on the bottom of my wood along the cut lines and it was a pain to sand off. t took me a bit to figure it out but I did. I tried different painters tape and spray glue but it was the packaging tape that i was using, as soon as I changed the type of tape it went away. I never did go back to that tape on other woods but I know I have not had it since I changed tape. It might be something to consider trying. Kurt Quote Link to comment Share on other sites More sharing options...
Phantom Scroller Posted April 5, 2015 Report Share Posted April 5, 2015 I use this on all my kit works a treat. Roly http://www.amazon.co.uk/WD-40-Specialist-400ml-Performance-Silicone/dp/B006UCNI38/ref=sr_1_sc_1?ie=UTF8&qid=1428216225&sr=8-1-spell&keywords=wd40+silcon+spray Quote Link to comment Share on other sites More sharing options...
heppnerguy Posted April 5, 2015 Report Share Posted April 5, 2015 My thoughts lean toward DW's views. I do not think the saw has anything todo with this problem. I it a fair punt of Oak with mine and I have yet to have this problem Dick heppnerguy Quote Link to comment Share on other sites More sharing options...
Lucky2 Posted April 6, 2015 Report Share Posted April 6, 2015 Dick, could you please let me know what you mean in the last part of your statement? The way the last sentence is worded is confusing, did you skip a word or two? Len Quote Link to comment Share on other sites More sharing options...
LarryEA Posted April 6, 2015 Report Share Posted April 6, 2015 Dick, could you please let me know what you mean in the last part of your statement? The way the last sentence is worded is confusing, did you skip a word or two? Len He said: I cut a fair amount of Ok wit hine and I have yet to have this probly not sullyscroller 1 Quote Link to comment Share on other sites More sharing options...
ubgoofy2003 Posted April 7, 2015 Report Share Posted April 7, 2015 Len, I think I would believe what you said is a good possibility. The sap in the wood will get hot & could turn a black color from the heat. Otherwise, I have no clue. Good luck, Jim. Quote Link to comment Share on other sites More sharing options...
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