1 of 1- cdavid
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Downloadable instructions....
I don't have a PC in my shop and don't want to run back-and-forth between the house and shop. Any place I can download the steps? Yeah, I know, paper...kind of old school.
- Wobbiegong
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Re: Downloadable instructions....
I know this does not help but a friend and I watched the video, then watched the video in the shop and stopped did an operation and then watched the video again for the next step. After we completed the first receiver we realized that if we would have just taken a few notes watching the video, we would have gotten most of the instructions just looking at a jig. The guy doing the video has to be a master machinist. I am sure there are shortcuts but he is trying to make sure everything comes out right. Taking your time is tough but the finished product is amazing. When you can see the reflections in the walls you just milled out, you know that you have a quality jig. The most time you will spend is the smallest holes. The most critical part is the big hole you drill without the jig. Getting it centered and the jig clamped down are critical. Don't forget to remove those two screwed in parts before you begin and put them in a baggie in a place you can find them later.
- cdavid
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Re: Downloadable instructions....
After starting on it, it became real obvious how intuitive the process is. I did come back a watch a couple places where technique was not so obvious and like you said made a cople notes (that I wrote on the box that I keep the jig parts in) and that was about it.
About the only problem I ran into, is my drill press doesn't have a quill lock like the vast majority of presses made in the last ten years. That's the key to to make this process easy. Had I not had to mickey mouse keeping the quuill in one place, The whole thing would have been done in a +/- a couple hours. Be interesting to hear how other have worked around this problem...without buying a milling machine that is.
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Thread Starter- Mike
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Re: Downloadable instructions....
Still working on it. So much visual info that I have to put into text.
- bwebster2629
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- Registered: 7/21/2015
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Re: Downloadable instructions....
The instructional videos are great! But as you have mentioned there is a lot of information in the videos to absorb.
I have gone through the video a number of times and have compiled a step by step process that seems to work for me. There may be some errors, so please check to be sure I have accurately represented the details of the video.
Broken Arms 80% Lower Jig
Drill Bits Used (all bits have 118 degree point angle)
1/8”, 5/32”, ¼” (Jobber Length)
3/8”, 7/16”, ½” (Stubby)
End Mills Used
¼”, 3/8”
STEP #1 – Put the lower receiver into the jig
STEP #2 – Use a 5/32” bit to drill out the Hammer Pin Hole, and Trigger Pin Hole
RPM – 720
STEP #3 – Use a 3/8” bit to drill out the Safety Hole
RPM – 500
STEP #4 – Use Plate #1, Use 1/8” drill bit to a depth of 1.250” for trigger pocket
Depth of .625” for rear shelf
RPM – 1325
Drill to a depth of about ¼” to spot the holes then remove the plate
and continue to drill to final depth of 1.250” and .625”
STEP #5 - Use a 7/16” drill bit to drill out a hole to a larger size and depth of:
[list=1]
[*]1.250” RPM – 385
This hole is the 5th hole (center line) from the back and drill
this hole to a depth of 1.250
[/list]
STEP #6 – Use Plate #2
Use 3/8” drill bit to 1.250” RPM - 385
Use 7/16” drill bit to 1.250” RPM – 385 Clamp jig down
Use ½” drill bit to .625” RPM – 385 Clamp jig down
STEP #7 – Use Plate #3
Use 3/8” drill bit to 1.250” RPM – 385 Clamp jig down
Use ½” drill bit to .625” RPM – 385 Clamp jig down
STEP #8 – Use Plate #4
Use 3/8” End Mill to 1.250” RPM - 2300
Start approx. .060” below top of lower and use conventional cutting
Use WD40 as cutting oil
At the bottom of the pocket we will have to use angle braces on
jig and then start in one corner so that the jig slides between the
angle braces
STEP #9 – Use Plate #5
Use 3/8” End Mill to .625" RPM – 2300 Rear Pocket
Be careful to allow room around the buffer tube area so that the
press does not hit it
Use ¼” Drill bit all the way through the trigger slot RPM – 720
Next use ¼” End Mill and use angle so that the jig slides freely
between them RPM - 2300
- Guest23
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Re: Downloadable instructions....
FWIW:
I also compiled a "Step-by-step" to use in my shop (garage) while completing my lower. I referenced the coresponding video times next to each step, just in case. I am not claiming that this is better or worse than bwebsters2629's. Just thought I'd offer mine too. 
BTW, there's nothing wrong with paper! It won't crash, freeze, get "accidentally deleted", etc... I always print what I can for reference. You never know...
Anyway, here's my rendition of instructions:
Completing the 80% Lower
Step 1: (4:36-7:21)
Use the 5/32” drill for the Hammer Pin and Trigger Pin holes.
Drill press speed 720 +/- (slower for a less rigid – faster for more rigid or mill).
Use cutting oil!
Step 2: (7:21-9:45)
Use 3/8” drill for Safety Selector hole.
Drill press speed 500 +/- (see notes on Step 1).
Use cutting oil!
Step 3: (9:45-12:35)
Use 1/8” drill for all Plate1 holes. Only drill to ~1/8” depth to “spot” all the holes.
Drill press speed 1325 +/- (see notes on Step 1).
Remove Plate1 after all holes have been drilled to 1/8” depth.
Use cutting oil!
Step 4: (12:35-14:52)
Use 1/8” drill for the 9 holes to 0.625” depth.
(Optionally, tape over these 9 holes to prevent accidental drilling in next step)
Drill press speed 1325 +/- (see notes on Step 1).
Use cutting oil!
Step 5: (14:52-17:49)
Use 1/8” drill for remaining holes to 1.25” depth.
Drill press speed 1325 +/- (see notes on Step 1).
Use cutting oil!
Step 6: (17:49-21:05)
Count 5 holes from rear on center line.
Use 7/16” drill to 1.25” depth.
Notes: Center drill on hole by lowering the bit on the hole and spinning the bit backwards.
Notes: Clamp jig!
Drill press speed 385-500 +/- (see notes on Step 1).
Use cutting oil!
Step 7: (21:05-24:45)
Install Plate2.
Use 3/8” drill for holes marked “3/8” to 1.25” depth.
Drill press speed 385 +/- (see notes on Step 1).
Use cutting oil!
Step 8: (24:45-26:25)
With Plate2 installed, use 7/16” drill for hole marked “7/16” to 1.25” depth.
Note: Will be drilling through half of a hole. CLAMP and GO SLOW!
Drill press speed 385 +/- (see notes on Step 1).
Use cutting oil!
Step 9: (26:25-27:34)
With Plate2 installed, use ½” drill for hole marked “1/2” to 0.625” depth.
Note: CLAMP!
Drill press speed 385 +/- (see notes on Step 1).
Use cutting oil!
Step 10: (27:34-31:55)
Install Plate3.
Use 3/8” drill for holes marked “3/8” to 1.25” depth.
Note: All holes are partial cuts. Clamp every hole!
Drill press speed 385 +/- (see notes on Step 1).
Use cutting oil!
Step 11: (31:55-34:37)
With Plate3 installed, use ½” drill for two holes marked “1/2” to 0.625” depth.
Note: Go slow, Big Drill!
Note: Clamp both holes!
Drill press speed 385 +/- (see notes on Step 1).
Use cutting oil!
Step 12: (34:37-45:52)
Install Plate4.
Use 3/8” end mill at ~0.060” at a pass.
Note: Move the jig in a clockwise motion. DO NOT move counterclockwise!
Drill press speed 2000-2300 +/- (see notes on Step 1).
Use WD-40 as cutting oil.
Step 13: (45:52-52:58)
With Plate4 installed, make a slow pass along bottom to smooth out the drill marks.
This should be done it at least two passes. Complete the “top” (right side) first. Then with several passes move clockwise around the bottom to smooth out the drill marks. Remember to go slow and use a vise/clamps!
(optionally, remove plate 4??)
Drill press speed 2000-2300 +/- (see notes on Step 1).
Use WD-40 as cutting oil.
Step 14: (52:58-58:09)
Install Plate5.
Use 3/8” end mill set to a depth of 0.625”. REAR POCKET
Note: Spindle should be set so that it does not hit the buffer tube hole.
Make cuts at ~0.060” per pass in a clockwise motion.
When the bottom of the pocket is reached, go slow to avoid “jumping” and chatter.
Drill press speed 2000-2300 +/- (see notes on Step 1).
Use WD-40 as cutting oil.
Step 15: (58:09-59:52)
With Plate5 installed, use ¼” drill, drill two holes at trigger slot, trying to stay away from the jig plate;
One hole to the front of the trigger hole, one hole to the rear of the trigger hole.
Note: Stay away from the jig fixture edges with the drill bit!
Drill press speed 720 +/- (see notes on Step 1).
Use WD-40 as cutting oil.
Step 16: (59:52-1:03:05)
With Plate5 installed, use ¼” end mill to make the trigger slot.
Use existing drill holes to make first slot. Go slow and use VISE or CLAMPS.
Now use the newly made slot to follow the jig hole in a clockwise motion. Go slow.
Drill press speed 2000-2300 +/- (see notes on Step 1).
Use WD-40 as cutting oil.
This is following the YouTube video from Broken Arms.