Thanks: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 10 of 10
Thread: Razor sharp or with a burr ?
-
20th May 2018, 12:07 PM #1Senior Member
- Join Date
- Oct 2008
- Location
- Bouvard - Western Australia
- Posts
- 325
Razor sharp or with a burr ?
After a heap of reading & watching Youtubes I have a question.
Skew chisels are very sharp with a honed cutting edge.
If the Negative Rake Scraper (NRS) is really a Skew chisel with a new name why is it many people say sharpen the NRS with a burr ?
I have noticed that this opinion is usually from USA sites & a few from the UK.
BTW....I have just shaped my skew with a radius cutting edge. It is terrific. IMHO
Cheers
ColChucks are like potato chips....you can't have just one.
www.bouvardbush.com
http://www.mandurahwoodturners.com/
-
20th May 2018 12:07 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
20th May 2018, 03:43 PM #2China
- Join Date
- Dec 2005
- Location
- South Australia
- Posts
- 4,475
Never heard of that, I sharpen to a edge
-
20th May 2018, 07:06 PM #3Member
- Join Date
- Sep 2008
- Location
- Richards Bay
- Age
- 74
- Posts
- 78
If you have a look at Steve Jones "Mr Woodturner" on Facebook honing is unnecessary. He uses his skew straight off the grindstone. A pink 100 grit I think. An he is very professional. I don't hone my skews scrapers and they work. Al Stirt takes off the burr and turns the edge to get a consistent "burr" for his shear scraping . So I guess you it depends on what you want to do.
-
20th May 2018, 07:20 PM #4
I periodically go back to the grinder and use unhoned after that without a burr.
In between I raise a burr with a diamond hone. I might do this a half a dozen times before returning to the grinder.
The burr is more fragile and doesn't last as long, but is quick to reestablish and get back to scraping again.
Eventually a regrind is needed to maintain an acute angle.
There are no rights or wrongs with this, IMO, just preferences.
Sent from my ZTE T84 using TapatalkStay sharp and stay safe!
Neil
-
20th May 2018, 07:56 PM #5
I've found that on the timbers I tend to turn (almost all Aus. HW) the burr disappears so fast that I may as well not have bothered raising it in the first place. Ditto with honing... the advantages gained by a honed edge are often shorter-lived than the time spent honing!
So I rarely bother and generally use my tools straight off the wheel.
Except for occasional finishing cuts where I am only cleaning up the surface, not shaping. Then a honed skew or burred NRS can make a real difference... and even then it depends heavily on the type of timber and crankiness of the grain.
It doesn't take long before you learn which timbers prefer which type of approach; there is no universal method.
- Andy Mc
-
21st May 2018, 06:57 AM #6GOLD MEMBER
- Join Date
- Sep 2008
- Location
- North Carolina, USA
- Posts
- 2,327
I do what Skew does. Agreed, every timber is different, some even within the same bowl. I sharpen my flat top scrapers upside down, so I get an automatic burr, to get a negative rake I tilt down. With some timbers for the last finishing cuts, I sharpen upside down then hone off the burr with a piece of 320 grit flat on the lathe bed, taking the very lightest cuts.
Spindles are tool handles I make for myself, they ain't gonna hang in the Louvre.So much timber, so little time.
Paul
-
21st May 2018, 08:59 AM #7SENIOR MEMBER
- Join Date
- Sep 2010
- Location
- Port Sorell, Tasmania
- Posts
- 592
There's a thread running on Sawmill Creek at the minute covering sharpening of scrapers, particularly NRS. This may be one of the US sites to which the OP refers but it covers several aspects of his questions.
https://sawmillcreek.org/showthread....aper-Questions
I only use a NRS for final very light finishing cuts to remove tool marks and torn grain. Also use shear scraper technique for torn grain but I don't quite have the tool control and still tend to leave fine ridges. When using the NRS for fine finishing cuts I want a fresh burr so it gives a clean cut and makes super fine wispy shavings. Don't get many passes with it but as the burr disappears the tool starts to tear the grain in the places with torn grain and I find I have to push harder to get it to cut.
Shear scraping also works on the burr on the tool. I find that I can use a burnishing rod to raise the burr on the scraper several times between grinds. Burnishing is quick and saves tool steel, particularly when you only get a couple of passes.
TonyYou can't use up creativity. The more you use, the more you have. ~Oscar Wilde
-
21st May 2018, 08:21 PM #8
The burr lasts less than 5 seconds on our timbers. I do however hone my neg raked scraper and my bowl gouge when I am attacking difficult tear out timbers
Neil____________________________________________Every day presents an opportunity to learn something new
-
23rd May 2018, 11:39 AM #9
Ditto
Different story if you are using a scraper to shape (I don't myself), in which case spending time raising a burr will be counter productive.
Contrary to the view of some 'purists', shaping with scrapers is a legitimate turning method. The old pattern makers all used it. I just find for myself that shaping with a cutting technique easier on my arms and shoulders than a heavy scraping technique.
PS - a burr turns a scraper into a cutting tool. But that is a topic that requires more explanation than is appropriate here.
Sent from my ZTE T84 using TapatalkStay sharp and stay safe!
Neil
-
27th May 2018, 09:50 PM #10New Member
- Join Date
- May 2018
- Location
- AU
- Posts
- 5
Similar Threads
-
Sharp (Rexon type) Drill Press , Sharp SE-330BS User Manual
By mike48 in forum GENERAL & SMALL MACHINERYReplies: 6Last Post: 24th January 2024, 08:08 PM -
Razor Sharp knife sharpening system - first impressions
By rsser in forum SHARPENINGReplies: 21Last Post: 10th June 2020, 02:57 PM -
Keeping chisels and plane irons razor sharp minimum fuss
By Tiger in forum SHARPENINGReplies: 13Last Post: 21st May 2015, 04:53 PM -
Hybrid boxes-burr oak, burr elm and LOOFAH!!
By cornucopia in forum WOODTURNING - GENERALReplies: 15Last Post: 6th September 2012, 05:09 PM -
Another Razor
By Whaler1 in forum WOODTURNING - PEN TURNINGReplies: 7Last Post: 8th January 2011, 05:58 PM