Checkering the 1911 Frontstrap

Frontstrap25Many hobbyist gunsmiths consider performing their own checkering of the front straps of their pistols.  To have this professionally done, which many times includes refinishing the frame, can be very expensive.  The expense is understandable due to the needed skills and the time required to complete this task.  Also, many pistol smiths dislike checkering because they consider the process to be too time consuming and, frankly, rather boring.  This is high on their list of gunsmithing tasks they would rather not do.

Here is a layout of what I consider to be the tools, skills and a sequential process of checkering a 1911 front strap.

First check the thickness of the metal on the front strap of the frame.  I lay a 1/2” steel rod in the inside of the frame, measure with calipers, and then subtract 0.50” from this measurement.  You need at least 0.030” metal thickness for 25 lpi checkering.

Here are the tools I use:

Frontstrap Tools
Frontstrap Tools

Top right to low left:

60 degree bent needle file, Brownells 080-648-604AK

Hand Needle file, #1,  ground safe on one edge, Brownells 249-211-212AK

Half Round file, #3, Brownells 249-215-231AK

6” Swiss Pattern Pillar file #0, Brownells 191-398-990AK

Checkering file, these come in 20 lpi, 25 lpi and 30 lpi, and even finer spacing,

Here I use a 25 lpi, Brownells 080-000-177AK

SDM 1911 Frame Holding Fixture, http://www.midwayusa.com/product/411823/sdm-1911-frame-holding-fixture-aluminum

Power Custom Universal Checkering Guide, http://www.midwayusa.com/product/233273/power-custom-universal-checkering-guide-1911  This is very inexpensive, but will produce excellent checkering.  You can spend ten times as much for a checkering guide and not get better results.

Brush removing filings from work.  I use a shaving brush.

The SDM frame holding fixture is not absolutely necessary, but it will save substantial time by using it.  It allows you to change the angle of the frame in your vice as you file different areas of the front strap.

You probably will also need magnification in order to see your work.  I use an OptiVISOR, Brownells 255-005-000AK

Here is a 1911 frame with the frame fixture, clamped in a workbench vise.  The checkering guide is being attached.  This Power Custom checkering guide will allow you to file exactly vertical on the front strap, even as you rotate the frame and fixture in the vice:

Frontstrap Frame Clamped
Frontstrap Frame Clamped

Next you can see the guiding edge of the checkering guide in place to guide the first vertical file strokes:

Frontstrap Frame Clamped
Frontstrap Frame Clamped

Next is shown how you lay the checkering file next to the checkering guide.  It is very important to keep this file in contact with the guide as you file.

Frontstrap4

Here is what the first few cuts look like.  Make these deep enough so that when the checkering guide is removed, the checkering file can easily follow these grooves.  This is how all the remaining vertical cuts are guided, by having part of the file following the initial cuts.

It is crucial that your file follows these first cuts.  A common error is that these next cuts are not parallel.

Frontstrap5
Frontstrap5

In filing these first cuts, they will show that the front of many front straps is not perfectly level.  This is because the finishing of front straps is done by hand at the factory.

Continue to file and deepen the grooves.  As you progress, more rows of file teeth start biting the metal, cutting more parallel lines.

As you file, stop often and brush away the filing, then closely examine your progress.   This also gives you a chance to rest.  If you push yourself too hard and become fatigued, they you lose your feel for the checkering file and then mistakes occur more easily.

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As you file, you should push down on the file.  Doing this for more than a few minutes will chew up the skin on your fingertips.  To prevent this, I wrap several layers of masking tape around both thumbs and both index fingers.

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Here is a filing technique that will speed up your filing.  Hold the file to about a 30 degree angle to the flat of the front strap and just file with the teeth on the very end of the file.  This creates metal filings much faster that when holding the file flat against the metal.   But this only will work if the lines have been started.  Don’t do this unless there are already some deep grooves for the file to follow.

Frontstrap8

Alternate this method with filing with the file flat against the metal.  By doing this, the bottom of the filed grooves stay smooth and flat.  Alternate from one technique to the other.  The filing of the vertical lines will require that you place a lot of pressure on the file.  Stop often to rest, brush off the filing, and then examine closely your progress.  Get into the habit of doing this throughout the checkering process.

The next photo shows how the initial filing spreads around the curve of the front strap.

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Note how the frame fixture is rotated in the vice.  This illustrates how you can rotate the frame, keeping the part you are filing on top, making it much easier to file.  This simple procedure makes the filing much more efficient and speeds up the whole process.

Frontstrap10

As the filing approaches the edge of the front strap curve, be very careful with your filing.  Do not let the file touch any part of the flat on the side of the frame.  This requires that you cut only with the very edge of the checkering file, so that the grooves do not extend past the rounded portion of the front strap.

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This next photo shows how the file is guided with both hands, taking care to keep the filing lines exactly in the grooves, keeping them parallel.  Being careful here will prevent cross thread filing.

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The next photo shows the progression of the filed vertical grooves toward the other side of the front strap.

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This show how finger tips are chewed up by the file.  Imagine your finger tips with no protection by the masking tape.

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At this point, all of the vertical lines are cut.  Make sure that the lines are cut to the full depth by the checkering file.  You can tell when the lines are at their full depth when it becomes easier to move the file.  The grooves are then at their full depth and the file is no longer cutting.

Now it is time to install the checkering guide, reversing it so that is guides horizontal grooves.

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Again, lay the checkering file in close contact with the guide.  It is important to make sure the edge of the file remains in contact with the guide as you file, to insure that the horizontal grooves are exactly 90 degrees to the vertical grooves.

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Once the horizontal grooves have been cut all the way around the front strap curve, then take off the checkering guide.  These first horizontal cuts should look like this.

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Continue filing horizontal cuts, using the first horizontal cuts to guide the checkering file.

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Continue filing horizontal cuts until you reach the point under the trigger guard where the front strap starts to curve toward the trigger guard.  Stop here.

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It is now time to start working on the contour of this curved portion of the front strap.  Here metal will be removed, allowing the top of the checkering to stand proud, higher than the curved portion.  A nice relief cut under the trigger guard is made, leaving the top line of checkering protruding.  To do a professional  job, the original contour must be preserved, so that it looks like it was done at the gun factory.

First, take the small flat file with the ‘safe’ edge, placing the safe edge into the last horizontal groove.  File around the curve of the front strap like this:

Frontstrap20

This file cut should look like this:

Frontstrap21

Next get the half round file and remove all of the vertical scratches on the curve under the trigger guard.  Keep removing metal until you get approximately to the depth of the top horizontal groove.  The next photo shows the half way done, just on one side.  Then complete the other side to match.

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Here are some supplies for completing this part of the job.  Take some fabric backed sandpaper and cut off a narrow strip, about 1/8 to ¼ inch wide.  I use 120 grit.

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Next take this sanding strip, using a shoe-shine motion, sand down any irregularities left after filing with the half round file.

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It should then look like this:

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Next, take the 60 degree needle file and start sharpening all of the small pyramid points of the checkering.  This will scratch up the trigger guard curve again, but this can be cleaned up with the half round file and sanding strips later.

The hand sharpening of each row of vertical and horizontal pyramids is very important.  How well this step is done will determine whether your checkering job looks professional or not.  I usually spend at least one hour doing this.  I then lightly follow up using the big checkering file to make sure the bottoms of all the grooves are at a uniform depth.  Again, this adds to a professional finished look.

Doing the vertical sides of the pyramids.  Start filing with the needle file exactly vertical with respect to the checkered surface.  Then tilt the file slightly to the right while filing, then tilt the file slightly to the left while filing.  Us a very light pressure on the file while doing this, as you don’t want to over-do the filing.  After a few file strokes, stop, brush off the filings, and look at your progress.  Then file some more, stopping often to assess progress.  Do this with every vertical groove.  The goal is for each pyramid to have a sharp point.  A knife-edge pyramid top needs to be touched up to get to a sharp point.

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Then finish filing the horizontal sides of the pyramids, filing lightly and stopping often to assess progress.  Use the same filing process described above for filing the vertical pyramids.

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Now closely examine the entire surface of the checkering.  Look for any pyramids that don’t have perfect points.  Then touch up these areas with the needle file.

Lastly, the edges of the checkering area, specifically the right and left sides, as well as the bottom, which is at the magazine well, will need to be finished.  This adds to the overall attractiveness of the checkering job, and removes areas that may snag on clothing, and will give the checkering job a nice, finish feel.

Here the 6” Swiss Pattern Pillar file is used to touch up both sides of the front strap.

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And the 60 degree curved needle file is used to touch up the bottom rows of the checkered area around the magazine well.

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The finished product:

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Another view.

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To prepare for refinishing the frame, the curved top above the checkering should be blasted to match the other curved surfaces of the 1911 frame.  Many like to blast the checkering too.  Tape off any area you do not want blasted.  If the frame is stainless steel, after blasting the checkering job is completed.  If a carbon steel frame, then the front strap area must be finished to match the rest of the frame, bluing, Parkerizing or spray coating.

If checkering a front strap is now something you want to do, first practice on a piece of 1” iron pipe.  Don’t try on an actual pistol frame until you have confidence by practicing first.


© Copyright 2014 Steve Locatelli, All rights Reserved. Written For: Armi Militari

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