The dye will transfer to the high spots. Then you would scrape the high spots with the scrapers. To do this you hold the handle missin from yours in your weak hand with the end of the scraper resting on the table at about a 30 to 45 degree angle then with your strong hand you'd bump the smooth side of the scraper with the palm of your hand or side of your fist.
This causes a small amount of steel to be 'scraped' from the bed. It's a long tedious process that is not very common any more. Kevin O. Pulver Guest. I've only heard of the manual scraping of lathe ways etc But I have a couple of sets of what you show that look sorta like a half round file with the "flat" side a bit concave, and the two edges sharp. I have used them for scraping babbitt bearings and they work very well. Mine are in an old wooden box fitted for them before tools came in disposable plastic pouches and they say "bearing scraper" on the label I believe.
The power scraper in the bottom picture looks like it's being used on a granite surface plate, possibly shaving down a repaired patch filling a hole. If you have a huge knick in the plate, it would need to be filled, and it looks like that power scraper is being used to knock the patch down before finish flattening.
I have seen a smaller version of that, which looked like an inline air chisel with a bearing scraper blade in it that was used for scraping the cross-slide ways in a couple of the Greenlee screw machines at one of the job shops I was in a few years ago. It can speed up the scraping process, but in the wrong hands, it make a good job go bad a lot quicker too.
I have some hand scrapers just like that. Some are factory made and have some curve to the ends. Some are just made from old files and work just as well.
I have one which is made from a drill shank with the end just ground square and its welded to the end of a bar. I use this for scraping grease grooves into bronze bushes. Are these the same? They appear to be. With the curved shank, they would be used more like what's shown in MD's first picture, guiding them with your hands and pushing with your body weight. OTTO-Sawyer said:. Click to expand Richard W. You move your shoulders in a circular motion while scraping and when your body starts the forward motion you stiffen your arms and scrape.
Thuss your body weight provide the mass inertia to remove material while scraping. JBoogie Registered. Otto, That isn't a granite plate, just looks like a plane surface with bluing on it to me. Bill Feasal said:. Gary Reif Registered. I also have one of the sets in the wooden box. Also have a small tool box full of different styles that are about 6" long and have a wood handle and a round shank with the blade shaped like a curved arrow head with sharp edges. IronworkerFXR Subscriber. The BIAX power scraper also has cutters to put the frosting on the ways for oil retention, my friend repairs industrial presses, a lost art.
You must log in or register to reply here. Similar threads F. Replies 4 Views 3, Jan 7, pegasuspinto. Replies 8 Views 2, Dec 14, Bill O. They're for large bearings so it's uncertain if I'll have occasion to use them but they're special in another way. The gentleman who passed them on to me is 89, has an interesting workshop with some machinery he's built himself and a large collection of various types of steam and IC engines he's built. Some were kits and some he just designed and built from odd parts including a brake master cylinder.
The ship had encountered a problem and limped into port where repairs were made. He didn't participate in any scraping, that was done by the engineers though he had a chance to watch.
One of them pointed out that the ship had three sets of scrapers on board and that he might need something like that sometime. Original box, unused appearance and even includes the original I presume rust preventive paper. These are for Babbitt and bronze only, too soft for cast iron.
They are historical artifacts, treasure them. Originally Posted by John Garner. Originally Posted by BGL. Yes those are ID or spoon scrapers. Forrest Addy would be the man to ask about those scrapers as he worked at a shipyard so I bet he has seen those scrapers types of scrapers or worked with the same brand. If they were on the ship they probably used them on many bronze and babbitt bearings through-out the engine room.
We always used Time Savers lapping compound first and then scraped oil pockets in to the bearings with a spoon scraper like those. Look at page 6 of the booklet to see the bearings and the Navy report. Rich I have a set of bearing scrapers that were made for scraping bronze bearings, but nothing as nice as those.
I work in the marine industry as a port engineer for a hopper dredge; ship repair. Been working in shipyards since the 70's. Was even around long enough to have worked on 1 or 2 Liberty ships and the old T2 tankers.
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