Author Topic: Question on polishing sand cast guard  (Read 5570 times)

Treebeard

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Question on polishing sand cast guard
« on: June 02, 2017, 11:44:38 PM »
I am at the point of installing a brass trigger guard that was sand cast. I have removed the rough texture with various fires and need to get the scratches polished out. Thought I would see if the forum have some preferred methods of doing this.




Offline Dr. Tim-Boone

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Re: Question on polishing sand cast guard
« Reply #1 on: June 02, 2017, 11:51:46 PM »
I use scrapers and then very fine sandpaper.........
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Offline Mike Brooks

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Re: Question on polishing sand cast guard
« Reply #2 on: June 03, 2017, 12:33:45 AM »
I use scrapers and then very fine sandpaper.........
Me too.
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Offline rich pierce

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Re: Question on polishing sand cast guard
« Reply #3 on: June 03, 2017, 01:18:28 AM »
I need somebody to show me, hands on, the scraper technique. I get chatter.
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eddillon

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Re: Question on polishing sand cast guard
« Reply #4 on: June 03, 2017, 02:18:56 AM »
I need somebody to show me, hands on, the scraper technique. I get chatter.
I don't hold the scraper at right angle with the direction of scrsping.  I hold at 25-30 degrees off the direction of the scraping.  No chatter.

Treebeard

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Re: Question on polishing sand cast guard
« Reply #5 on: June 03, 2017, 02:45:07 AM »
So what do you use for a scraper? This is my first time at this and thanks for the help!

Offline jerrywh

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Re: Question on polishing sand cast guard
« Reply #6 on: June 03, 2017, 04:45:17 AM »
 If you scrape don't scrape at the same angle every pass. Try to cross the ridges at an angle. I have scraped but never do now. Sandpaper glued to sticks with elmers spray contact glue.
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Offline Tim Crosby

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« Last Edit: June 03, 2017, 02:36:16 PM by Tim Crosby »

Offline Gaeckle

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Re: Question on polishing sand cast guard
« Reply #8 on: June 03, 2017, 03:41:44 PM »
So what do you use for a scraper? This is my first time at this and thanks for the help!

I make scrapers from old sawsall blades, allen wrenches that I flatten and grind, broken needle files that I reshape and I often reshape old needle files. This is mostly a process of discovery, try a little bit of this, a little bit of that, till you find what works.

Offline oldtravler61

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Re: Question on polishing sand cast guard
« Reply #9 on: June 03, 2017, 06:29:40 PM »
  I just use very fine teeth files. Then scotch bright pads. But I am not after a super finish. Oldtravler

Offline bama

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Re: Question on polishing sand cast guard
« Reply #10 on: June 03, 2017, 07:29:59 PM »
Fine files will do the job if you have them. fine sandpaper back with a file will do or like Jerry suggested glue the paper to a backer.
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Offline Daryl

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Re: Question on polishing sand cast guard
« Reply #11 on: June 03, 2017, 08:20:14 PM »
Lots of scraping needed, maybe some heavy rasping, to take a sand cast and make it look a wee bit nicer.

Daryl

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Treebeard

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Re: Question on polishing sand cast guard
« Reply #12 on: June 03, 2017, 08:37:48 PM »
I am always impressed at the variety of solutions the forum members have to accomplish any particular task. It really gives a newbie a choice in methods that suit him best and learn from.

eddillon

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Re: Question on polishing sand cast guard
« Reply #13 on: June 03, 2017, 09:07:19 PM »
So what do you use for a scraper? This is my first time at this and thanks for the help!
  I use a Sandvik and a variety of Jerry Fisher inletting scrapers

Offline Tim Crosby

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Re: Question on polishing sand cast guard
« Reply #14 on: June 04, 2017, 12:43:21 AM »
So what do you use for a scraper? This is my first time at this and thanks for the help!

I make scrapers from old sawsall blades, allen wrenches that I flatten and grind, broken needle files that I reshape and I often reshape old needle files. This is mostly a process of discovery, try a little bit of this, a little bit of that, till you find what works.

 Hey John, post a couple Pix of those. The one you gave me is indispensable, lots of uses and it stays sharp.

   Tim


Offline Gaeckle

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Re: Question on polishing sand cast guard
« Reply #15 on: June 04, 2017, 07:34:29 AM »
So what do you use for a scraper? This is my first time at this and thanks for the help!

I make scrapers from old sawsall blades, allen wrenches that I flatten and grind, broken needle files that I reshape and I often reshape old needle files. This is mostly a process of discovery, try a little bit of this, a little bit of that, till you find what works.

 Hey John, post a couple Pix of those. The one you gave me is indispensable, lots of uses and it stays sharp.

   Tim


Okay...I'll try to get it posted as soon as possible....I made about 10 or so and probably have a few laying around.

Offline D. Taylor Sapergia

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Re: Question on polishing sand cast guard
« Reply #16 on: June 04, 2017, 08:03:39 PM »
Daryl showed an image of a split guard I made for a Wm. Antes swivel breech rifle, from a sand casting from TOW.  There is enough brass in the rough casting for two guards, but that is good when you are creating a particular guard from a 'blank'.  I use course metal cutting rasps, set aside exclusively for brass, then finer files, and finally various grits of abrasive cloth backed with files, strips of wood, rubber hose in various diameters...etc.  I polish to 600 usually then burnish with four ought steel wool.  As I go through the various abrasive cloth, starting at 80 grit removing file marks, I cut across the brass at a different angle from the last, and continue with this process, always creating a new set of marks removing the last, always at a different angle.  And as the abrasive gets finer and finer, less time and effort is required to remove the scratches left from the previous.  I'll have to try scraping...
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Offline Joe S.

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Re: Question on polishing sand cast guard
« Reply #17 on: June 04, 2017, 08:30:37 PM »
I will add this,while no expert here I wouldn't try to outsmart yourself thinking you can speed up the process using power tools.I thought using a dremel on a piece would speed things up abit.While I thought at first this is great,when I finally got down to fine grits and had a better look at the sheen in the light I had lots of subtle ripples in the metal.The more you polished the more they stood out,do over,lesson learned.

Offline Gaeckle

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Re: Question on polishing sand cast guard
« Reply #18 on: June 05, 2017, 03:11:19 AM »
Here are the scrapers I make




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I make them from old saws all blades. They work like a hook cutter and they are flexible so you can adjust the amount they cut by the pressure you apply. Add more pressure and it cuts a lot, add less and you can polish.

Offline thecapgunkid

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Re: Question on polishing sand cast guard
« Reply #19 on: June 08, 2017, 12:17:20 PM »
Learned a lot off this post.

Thanks

Greg