• This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn more.
  • Guest,  We want to wish You and Your Family a Healthy, Happy Thanksgiving! Click the "X" at the top right corner to remove this notice)
  • PLEASE: Read the FORUM RULES BEFORE registering!

4

Home made power scraper

3
Like what you see?
Click here to donate to this forum and upgrade your account!
10

Holescreek

Active User
Active Member
Joined
Nov 10, 2013
Messages
643
Likes
511
#1
I haven't done any scraping in a long time but though I'd share how I made my own power scraper.

scraper010.jpg

The whole project is based on a variable speed Harbor Freight sawzall where the saw blade is replaced by a carbide tipped insert. The only difficult part is modifying the reciprocating mechanism to make the stroke adjustable.

scraper001.jpg

After disassembling and cleaning I decided to remove the fixed post and milled a dovetail slot so I could add an adjustable bearing post in its place.

scraper006.jpg

scraper007.jpg

The inset is brazed onto a mild steel flat bar ad ground just as you would for hand scraping.

scraper008.jpg

- - - Updated - - -

scraper009.jpg

At first it was a little choppy until I settled on an 1/8" stroke and learned to cradle the sawzall on top of my forearm with the handle resting against the inside of my elbow. I use my free hand to help guide the blade while the hand underneath is supporting the weight. After a little experimenting it became natural and what took days by hand was done in a couple of hours.

Scraping002.jpg

There used to be a video of me using it online somewhere, not sure where it is now.
 

Attachments

astjp2

Active User
Active Member
Joined
Aug 23, 2013
Messages
727
Likes
77
#2
Too bad you don't make the conversion parts for us who don't have time or the tools to make our own. Tim
 

bcall2043

Active User
Active Member
Joined
Oct 6, 2010
Messages
697
Likes
27
#3
The whole project is based on a variable speed Harbor Freight sawzall where the saw blade is replaced by a carbide tipped insert. The only difficult part is modifying the reciprocating mechanism to make the stroke adjustabl


There used to be a video of me using it online somewhere, not sure where it is now.
Thanks for the post. I just picked a reciprocating saw with a bad motor at the scrap yard a week or so ago. My thought was to try the same approach as you have. You have proved the concept and I now have the mechanism to play with (read "ruin") before I spend the money to ruin a good one.

Any other suggestions or thoughts about attempting to copy your project?

Benny
The Orphanage Never Closes
 

Holescreek

Active User
Active Member
Joined
Nov 10, 2013
Messages
643
Likes
511
#4
Thanks for the post. I just picked a reciprocating saw with a bad motor at the scrap yard a week or so ago. My thought was to try the same approach as you have. You have proved the concept and I now have the mechanism to play with (read "ruin") before I spend the money to ruin a good one.

Any other suggestions or thoughts about attempting to copy your project?

Benny
The Orphanage Never Closes
Just be prepared to hear "it will never work" a lot.
 

Dresden

Iron
Registered Member
Joined
Feb 25, 2014
Messages
17
Likes
5
#5
That surface looks scratched not cut, a Biax scraper has ergonomics designed for the job the saw is designed for a different use, if you use both side to side you will see the difference.
 

Holescreek

Active User
Active Member
Joined
Nov 10, 2013
Messages
643
Likes
511
#6
To each their own. If I was scraping for a living I would show up with proffesional equipment. Since I'm not even a wana-be machine tool builder I used what made sense. I've scraped enough by hand to know the action is the same, its not been an issue for me. People sink a lot of money in specialty equipment just for bragging rights.
 

tertiaryjim

Active User
H-M Supporter-Premium Member
Joined
Mar 3, 2014
Messages
519
Likes
218
#7
Have seen a post by another member who did the same. Perhaps that was you.
This is something I would like to do when I have the time.
Tool geometry and speed could perhaps be adjusted for a better job.
All the time saved could be used for making more tools. OH BOY!
 

Silverbullet

Active Member
Active Member
Joined
May 4, 2015
Messages
2,359
Likes
1,067
#8
No two scrappings will ever look alike , unless done by a machine. Hand scrapping is just that each person who does scrapping will create there own lines or design pattern. Even tho it's straight line , the whole idea is to get the surface flat and leave tiny scratching for oil to lay in. I've seen real beautiful patterns and others where the lines cross and no lines straight hardly at all. Just remember they're for oil not appearance. At least that's what I've learned over the past forty years.
 

4gsr

HM Chief Foreman
Staff member
H-M Supporter-Premium Member
Joined
Aug 8, 2011
Messages
4,409
Likes
2,667
#9
That surface looks scratched not cut, a Biax scraper has ergonomics designed for the job the saw is designed for a different use, if you use both side to side you will see the difference.
Who cares if it is scratched. I've been doing this kind of stuff since I was 15 years old! And I still scratch! and I own a Biax, too!

Go easy on these guys. We can use some pointers to do better. We want to learn. Most of us here are not able to go out and buy the 'good tools of the trade' to do the job right. But we getting better and smarter!
 

Old junk

Active Member
Active Member
Joined
Mar 2, 2017
Messages
67
Likes
46
#11
Making a tool to do a job is why we are here.i like it.few things feel as good as using a tool you made.
 

Keith Foor

Active Member
Active Member
Joined
Aug 4, 2015
Messages
278
Likes
203
#13
I was just thinking that the little M12 sawzall that is battery powered would be a good candidate for this modification. It's smaller and light weight. Not sure on the battery idea though. Now sure how long it would run. But this has merit and is worth playing with. Pawn shops are full of old saws that are missing the front guide that can be had for next to nothing because they are missing parts
 
[6]
5 [7]