Thread: Is this surface hand scraped?

Hi,

I looked at it a couple of times, I think it might be machining marks. The patches look pretty deep for scraping. One of the blokes who know about scraping may answer your question better. Does the surface in question feel smooth or uneven (ie can you feel indentations or high/lows spots)?

Ben

Ouch. Scraped with a hammer & screwdriver by the look of it.

Ouch. Scraped with a hammer & screwdriver by the look of it.

Nick

Looks like it's been done very, very carefully.......... with a small angle grinder.

Simon

Originally Posted by bwal74

Does the surface in question feel smooth or uneven (ie can you feel indentations or high/lows spots)?

I didn't feel it Ben and now the vice has been reassembled.

The other side of this part of the vice has the same texture, but every other sliding surface on the vice has been milled. Maybe it wouldn't go together properly in the factory and the "quality control" person cleaned it up with a axe.

I think that would have been a tiny screwdriver Stuart and Nick.
For scale, Jack, can you confirm that the gib adjusting screws are M5 or M6 or larger?
If they are M5 as on my cross vice, then the scraping marks are barely 1mm wide and not very deep at all. They appear to be made in just one direction - 90 deg to the machining marks clearly visible in the top left 1/3rd, and cross hatched in the left lower 1/3rd of the photo.
They look targeted just like scraping marks and the background where there are no visible machining marks look like the surface has even been stoned after "scraping".
I just can't imagine what could have made these tiny evenly spaced marks. The closest I can get to picturing it would be a thin grinding wheel in a Dremel tool 'rubbed' over the surface....
Cheers,
Joe

I’ve seen some Asian guys that scrap like that. That’s a really bad example of it. They stand the handle up nearly vertical, and strike it, not unlike bump mottling.

See how the scrap mark ends up with an abrupt line. In this case he was hitting towards the upper left hand corner, almost pointing at the upper left adjustment screw. They sort of stall the blade at the end of the cut, and you get those sharp fall offs at the end of the stroke.

I can tell you from that picture, the guy that did that would be a really BAD golfer. He’d only make divots. There’s nothing left of that surface to make contact.

Phil.

Originally Posted by jhovel

For scale, Jack, can you confirm that the gib adjusting screws are M5 or M6 or larger?

Joe,
the screws are 1/4" either UNC or BSW.

I just can't imagine what could have made these tiny evenly spaced marks.

That's child's work!
At least, quite childish.


Nick

Probably a more representative pic of what it should look like..... Although swiss type scraping looks totally different to this which is power scraped

So it looks like a very rough scraping job. But why bother? Wouldn't it be easier to send it back to the milling machine? I'm surprised a Taiwanese factory would bother. Unless the previous owner had a crack at it?

Originally Posted by jack620

So it looks like a very rough scraping job. But why bother? Wouldn't it be easier to send it back to the milling machine?

Just add it to the long list of manufacturing mysteries from the orient.

Originally Posted by .RC.

Probably a more representative pic of what it should look like.....

Showoff.

Originally Posted by .RC.

Probably a more representative pic of what it should look like..... Although swiss type scraping looks totally different to this which is power scraped

FM! That's impressive. Your handiwork RC?

Yea my handiwork..