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Thread: Taper Grinding Saw Blades
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30th October 2017, 12:13 PM #1
Taper Grinding Saw Blades
Glorious Fall weather has coincided with some free time. I haven't really touched saw making for more than a year but today I had an opportunity to make some taper ground backsaw blades that I've been meaning to get to for a long time now .
It occurred to me that although I've described the process I use I've never posted pictures so here goes.
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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30th October 2017, 10:56 PM #2GOLD MEMBER
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Nicely done. Are you grinding both sides or just one?
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31st October 2017, 10:53 AM #3
Yes, you must grind both sides as evenly as possible. Due to the stresses inherent in this type of stock if the grind lacks bilateral uniformity you get a curved toothline that can't be fixed by adjusting the back.
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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1st November 2017, 08:15 PM #4
Rob,
Do you think taper grinding could be done by placing the plate down on a piece of say MDF held down with double sided tape the saw plate.
Using a belt sander.
Than flip it and do the other side.
Cheers Matt
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1st November 2017, 11:06 PM #5
Matt,
Yes, it is possible to taper grind with a handheld belt sander. Trick is to find belts that will tolerate grinding hardened steel. Aluminum oxide belts will do the job but you'll wear out several doing a single blade. This was the first way I tried, I'm on version #4.5 in my techniques - building a new machine now.
Cheers,
RobInnovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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6th February 2018, 02:48 AM #6Intermediate Member
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6th February 2018, 07:26 AM #7Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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6th February 2018, 12:02 PM #8Intermediate Member
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14th February 2018, 03:02 AM #9
Correction to the record
I've been reading a good deal on steel and industrial technology generally lately and have come across a couple of books that are quite good. The first is Metallurgy for Non-metallurgists published ASM International (formerly American Society for Metals). I found this copy of the 2015 printing at a good price recently.
Metallurgy cover shot.JPG
I highly recommend the book, excellent writing and technical content.
Interestingly I found this at the end of the first chapter contained in a list of technological achievements in metallurgy of the early 20th century.
Disston use of inductive furnace cropped.JPG
which provides important additional detail (inductive melting) to the information presented on the Disstonian Institute site at Online Reference of Disston Saws -- No.7 and D7 Models
excerpt from Disstonian on steelmaking.JPG
which has been misinterpreted in online discussions as being electric arc melting.
The next book of interest on the subject is this one.
Steel city cover.JPG
Tweedale emphasizes throughout the text that the steelmakers of Sheffield suffered greatly because of their resistance to change at level of both management and employee. Electric arc furnaces, developed in France, were only introduced in Sheffield in 1910, four years after it was introduced in America. Thus, even at the time of the birth of metallurgy Sheffield was losing it's primacy in steel.Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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14th February 2018, 06:24 AM #10
interesting observation.
William Slim, in his book Defeat into Victory (which primarily deals with the WWII campaign against the Japanese in Burma) relates an anecdote from just before WWI when he was a very junior "white collar" (= lower middle class) worker in a Sheffield steel mill. Slim speaks of the fear in the eyes of one highly experienced [lower class] worker, whose job entailed heating the end of a bar or tube to a precise temperature -- determined by the colour of the bar -- prior to the bar being "bulged" in a press. The worker's fear came from the likely consequences should his skill in determining the best forging temperature for the bulge be replaced by a more precise temperature gauge.regards from Alberta, Canada
ian
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13th January 2019, 03:35 PM #11
Saw Blade Taper Grinding Machine v. 3.5
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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13th January 2019, 03:41 PM #12
Have a video but it's .mov, how do I upload it?
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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13th January 2019, 03:47 PM #13
Another view.
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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16th January 2019, 10:54 AM #14
Rob
That is such a good idea. I am assuming that the belts are just slightly larger than the uninflated tyre and it "tensions" up when inflated.
Regards
Paul
Ps: Can't help with the vid issue. That is another thing at which I am no good . But I am interested to know how .Bushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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16th January 2019, 10:57 AM #15
Rob
Looking at the wheels (and the hub) and noting it is sitting on a bench or stand. I realise the wheels are from a small vehicle such as a ride on lawn mower or similar. What size motor is driving the sander? I appreciate it is geared down with the pulleys.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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