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View Karda's profile

scrapper angles

by Karda
posted 08-15-2017 06:45 AM


20 replies so far

View kaerlighedsbamsen's profile

kaerlighedsbamsen

1248 posts in 1712 days


#1 posted 08-15-2017 10:08 AM

Would love to help but not sure what you mean by round nose scrapper? A picture/drawing might help getting answers.
In genneral card scrapers and beading scrapers are ground to 90 degrees and scraper planes 45 before burnishing

-- "Do or Do not. There is no try." - Yoda

View LeeMills's profile

LeeMills

543 posts in 1300 days


#2 posted 08-15-2017 12:58 PM

It may take a little playing around to find what you like best. Most are in the 70-80* range. Some folks like a lower angle down in the 55-65. Typically the lower the angle the quicker the edge blunts. I think it will depend on whether you are you are using it for bulk removal or for just final light cleanup.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View Karda's profile

Karda

1075 posts in 552 days


#3 posted 08-15-2017 05:29 PM

Thanks lee that gives me a starting point.
Here is a picture of a round scraper as requested.

View TheDane's profile

TheDane

5423 posts in 3662 days


#4 posted 08-15-2017 07:59 PM

Would love to help but not sure what you mean by round nose scrapper? A picture/drawing might help getting answers.
In genneral card scrapers and beading scrapers are ground to 90 degrees and scraper planes 45 before burnishing

- kaerlighedsbamsen

He is asking about scrapers used in woodturning on a lathe.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View Karda's profile

Karda

1075 posts in 552 days


#5 posted 08-15-2017 11:20 PM

sorry should have been specific I forgot about card scrapers

View papadan's profile

papadan

3584 posts in 3367 days


#6 posted 08-15-2017 11:25 PM

Mike, I use card scrappers in turning. Helps smooth out bowls and plates when finishing.

View putty's profile

putty

1189 posts in 1605 days


#7 posted 08-15-2017 11:45 PM



Mike, I use card scrappers in turning. Helps smooth out bowls and plates when finishing.

- papadan

Well, that is interesting I’ll have to try that…thanks

-- Putty

View Nubsnstubs's profile

Nubsnstubs

1287 posts in 1729 days


#8 posted 08-15-2017 11:47 PM

Mike, my leaf spring scraper I made is at 65 degrees. Works great. What are you making it out of? ....... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

View Karda's profile

Karda

1075 posts in 552 days


#9 posted 08-16-2017 03:20 AM

sorry Jerry I cheated I ordered a piece of 1095. after I cut it I have a 1 inch and a half inch . Now all I got to do is learn how to get them ot enough in the forge. I was going to try leaf spring but I decided to try a small piece I still have a lot to learn about just getting the bed of coal right, right now I am using wood not charcoal.

View Bill7255's profile

Bill7255

427 posts in 2283 days


#10 posted 08-16-2017 11:49 AM


Mike, I use card scrappers in turning. Helps smooth out bowls and plates when finishing.

- papadan

Well, that is interesting I ll have to try that…thanks

- putty


Card scrapers work well for removing small amounts of tear out. I use the all the time.

-- Bill R

View Karda's profile

Karda

1075 posts in 552 days


#11 posted 08-16-2017 05:48 PM

how do you use card scrappers same as a turning tool

View papadan's profile

papadan

3584 posts in 3367 days


#12 posted 08-16-2017 11:13 PM



how do you use card scrappers same as a turning tool

- Karda


Just like any other tool, just hold it tight and just below center.

View REO's profile

REO

928 posts in 2073 days


#13 posted 08-17-2017 12:03 AM

Hmmmmm scrapers are the only tool I am aware of INTENTIONALY presented below center. all tools can be used as scrapers, but the rest are intended to shear the chip. gouges at or above center. bedan at or above center. skew definitely above center. if presented at or below center on external turnings a scraper CAN have a 90 degree edge then for the interior present above center and you can avoid some traumatic although very exciting events!

View Bill7255's profile

Bill7255

427 posts in 2283 days


#14 posted 08-17-2017 12:03 PM

I don’t use card scrapers with the lathe running!!!! Only with the lathe off to work small areas of imperfection.

-- Bill R

View Abter's profile

Abter

55 posts in 626 days


#15 posted 08-17-2017 04:31 PM


It may take a little playing around to find what you like best. Most are in the 70-80 range. Some folks like a lower angle down in the 55-65. Typically the lower the angle the quicker the edge blunts. I think it will depend on whether you are you are using it for bulk removal or for just final light cleanup.
- LeeMills

Newbie question: which angle goes with which purpose? In other words, is steep angle better for hogging or cleanup?

-- "Many men fish all their lives without ever realizing that it is not the fish they are after." {often mis-quoted as by H.D. Thoreau}

View Abter's profile

Abter

55 posts in 626 days


#16 posted 08-17-2017 04:34 PM

double post

-- "Many men fish all their lives without ever realizing that it is not the fish they are after." {often mis-quoted as by H.D. Thoreau}

View LeeMills's profile

LeeMills

543 posts in 1300 days


#17 posted 08-19-2017 12:41 PM

Abter, just my opinion but for hogging or roughing I would want a steeper angle like the 70-80. For cleanup I use it presented angled in more of a cutting action and a lower angle on the tool (down to 45); the lower grind may provide a better cut but it also dulls quicker.

I would suggest looking up robo hippy on youtube as he has a lot of videos on scrapers.
Here is also a good article by Doc Green discussing scrapers, burrs, and angles.
http://www.docgreenwoodturner.com/scrapers1.html

Sorry I can’t help a lot because I normally use gouges except for fine cleanup. The exception being I do use carbide tools sometimes for roughing but they are just another type of scraper.

additional… Brian Havens also has some good videos on conventional scraping, negative rake, and sheer (shear) scraping.
https://www.youtube.com/results?search_query=brian+havens+woodturning+scrapers

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View Karda's profile

Karda

1075 posts in 552 days


#18 posted 08-20-2017 02:42 AM

thanks for the suggestions Lee, I have watched tose videos, several times but they don’t say much about angles

View Bill7255's profile

Bill7255

427 posts in 2283 days


#19 posted 08-20-2017 01:44 PM

Start with 70 degree. This is a good angle that will allow shaping. Lower angles also work and give a little bit better finish, but require more frequent sharpening. I have multiple scrapers for different purposes, but mainly use the 70 degree scrapers. Expensive, but the Thompson tools are well worth the money. If it is a tool that I will be using a lot I have gone to getting the Thompson tools. I have two 1-1/4” Thompson scrapers and they far exceed any HSS tool I have made. If it is a tool for very limited use I buy the cheapest tool I can find or make one. Know also that the finish with a scraper will not be as good as the finish using a bowl gouge.

-- Bill R

View Karda's profile

Karda

1075 posts in 552 days


#20 posted 08-20-2017 06:03 PM

ok thanks

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