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Posted: 3/23/2015 5:52:42 AM EDT
[#1]
cool
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Posted: 3/23/2015 10:58:52 AM EDT
[#2]
Did you find out yet what accounted for the discrepancy in the specs of the lower? The big indexable cutter must have hooked a corner hard enough to move it in the vise. It was off by 0.143", which is just a goofy number, so not a calculation error. Those tend to be completely round numbers or a cutter radius/diameter. |
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Posted: 3/23/2015 11:22:53 AM EDT
[#3]
Quote HistoryQuoted:
The big indexable cutter must have hooked a corner hard enough to move it in the vise. It was off by 0.143", which is just a goofy number, so not a calculation error. Those tend to be completely round numbers or a cutter radius/diameter. Quote HistoryQuoted:
Did you find out yet what accounted for the discrepancy in the specs of the lower? The big indexable cutter must have hooked a corner hard enough to move it in the vise. It was off by 0.143", which is just a goofy number, so not a calculation error. Those tend to be completely round numbers or a cutter radius/diameter. Twice I've had my X axis igagingdro jump on me. Both times I luckily noticed something was wrong before I cut something I should't have. Nice work BTW, you are a tremendous inspiration. I've shown the 1/2 scale thread to a dozen different people. All are simply amazed. Excellent recovery on the oops, I feel for ya tho, these minor imperfections that in the end don't matter, still bother ya WAY too much. |
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Posted: 3/23/2015 12:14:55 PM EDT
[#4]
Twice I've had my X axis igagingdro jump on me. Both times I luckily noticed something was wrong before I cut something I should't have. By .200"? lol. Y-Axis used to do that to me from time to time, not matter how clean I kept it. Always .200" exactly. Ended up replacing the encoder, all is well now. Other than that, the only issue I've had with them was on my smaller machine when a solder joint inside the encoder began failing. It would jump all over the place, whether it was moving on the scale or not. That was fixable, though |
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Posted: 3/23/2015 12:25:19 PM EDT
[#5]
One of the times it was over an inch off. No idea why. I don't remember how far it was off the other time, but I remember it was quite obvious. My X axis gets a lot ofchchips, so I just assumed that was it. Another time the Z was off, but found that was just the connection on the display. All in all, they are still worth every penny. I can't imagine trying to count turns and account for backlash on my little mill. Everything would take 10-20x longer if for nothing more than stopping to Mic everything all the time.
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Posted: 3/23/2015 12:36:58 PM EDT
[#6]
My X axis gets a lot ofchchips, so I just assumed that was it. Probably, especially if it was a random amount. I have them covered, use pieces of heavy duty drawer liner material. A roll of the stuff is about $11 at wal mart, just cut a strip and fold it over the whole scale, zip tie the ends. I'll try to get a pic later to show you. I can't imagine trying to count turns and account for backlash on my little mill. Everything would take 10-20x longer if for nothing more than stopping to Mic everything all the time. I operated that way for a long time, and yes, it sucks-especially with the mini mills and their 0.0625 per revolution travel. Also, very few lead screws are consistent enough to hold 0.001 the length of the axis even with backlash accounted for. In my experience, these Igaging DROs definitely hold 0.001" if they're mounted properly. If one has to do better, then spendy glass scales are the only option. But very few projects require tolerances in tenths, and very few machines can hold tenths. Even expensive VMCs have trouble doing any better than .0005" across an axis. |
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Posted: 3/23/2015 7:15:51 PM EDT
[#7]
Quote HistoryQuoted:
Probably, especially if it was a random amount. I have them covered, use pieces of heavy duty drawer liner material. A roll of the stuff is about $11 at wal mart, just cut a strip and fold it over the whole scale, zip tie the ends. I'll try to get a pic later to show you. I operated that way for a long time, and yes, it sucks-especially with the mini mills and their 0.0625 per revolution travel. Also, very few lead screws are consistent enough to hold 0.001 the length of the axis even with backlash accounted for. In my experience, these Igaging DROs definitely hold 0.001" if they're mounted properly. If one has to do better, then spendy glass scales are the only option. But very few projects require tolerances in tenths, and very few machines can hold tenths. Even expensive VMCs have trouble doing any better than .0005" across an axis. Quote HistoryQuoted:
My X axis gets a lot ofchchips, so I just assumed that was it. Probably, especially if it was a random amount. I have them covered, use pieces of heavy duty drawer liner material. A roll of the stuff is about $11 at wal mart, just cut a strip and fold it over the whole scale, zip tie the ends. I'll try to get a pic later to show you. I can't imagine trying to count turns and account for backlash on my little mill. Everything would take 10-20x longer if for nothing more than stopping to Mic everything all the time. I operated that way for a long time, and yes, it sucks-especially with the mini mills and their 0.0625 per revolution travel. Also, very few lead screws are consistent enough to hold 0.001 the length of the axis even with backlash accounted for. In my experience, these Igaging DROs definitely hold 0.001" if they're mounted properly. If one has to do better, then spendy glass scales are the only option. But very few projects require tolerances in tenths, and very few machines can hold tenths. Even expensive VMCs have trouble doing any better than .0005" across an axis. Good info. Thanks for all of this. To Nottooslow too. You're an inspiration and a true asset to ARFcom. Please keep it coming! |
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Posted: 3/23/2015 8:44:13 PM EDT
[#8]
Wow OP, U gotz some mad skillz!
Very cool. I know know my life has been wasted not learning how to do cool stuff like this. 
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Posted: 3/24/2015 12:04:45 AM EDT
[#9]
Nice work. I have a made couple from scratch but I'd never attempt steel.
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Posted: 3/24/2015 7:42:27 PM EDT
[#10]
Props to you on making one out of steel, that takes some patience! Looks great!
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Posted: 3/25/2015 4:41:38 PM EDT
[#11]
Getting closer.....
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Posted: 3/26/2015 10:58:26 PM EDT
[#12]
tag...cool!
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Posted: 3/27/2015 3:20:54 PM EDT
[#13]
That is awesome!! Great work! I am impressed. |
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Posted: 3/27/2015 3:50:32 PM EDT
[#14]
Freaking cool. Nice save with the welding, too.
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Posted: 3/27/2015 4:21:47 PM EDT
[#15]
much respect for taking this on in steel and the manual mill.
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Posted: 4/2/2015 3:16:22 PM EDT
[#16]
Any updates on this?
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Posted: 4/2/2015 4:02:22 PM EDT
[#17]
Well, my long 3/32 drill finally showed up yesterday, so now it's just ceracoating. Hopefully we'll have that squared away before next week, then just transfer all the parts out of the forged 7075 receiver into this one and reassemble this rifle with the steel lower:
And final weight is 1.78 lbs, just a little more than triple that of a standard forged lower. |
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Posted: 4/7/2015 8:59:00 PM EDT
[#18]
And done!
Took quite a bit of fitting, as it was very tight before the ceracoat. But it's there now, with zero wiggle! Rifle now weighs 16.3 lbs with a loaded 20 round mag. lol. 
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Posted: 4/7/2015 9:26:23 PM EDT
[#19]
Quote HistoryQuoted: And done! http://i110.photobucket.com/albums/n117/Hunter2506/Machining%20projects/8ed7a40f-c07c-4a62-9e9e-e46c42d8a2cc_zpsi08klity.jpg http://i110.photobucket.com/albums/n117/Hunter2506/Machining%20projects/IMG_1394_zpsihb4uzqo.jpg Took quite a bit of fitting, as it was very tight before the ceracoat. But it's there now, with zero wiggle! Rifle now weighs 16.3 lbs with a loaded 20 round mag. lol. http://i110.photobucket.com/albums/n117/Hunter2506/Machining%20projects/bd303097-1d0f-45d9-bc3d-fb9d8929e2fe_zpssa2gzs98.jpg http://i110.photobucket.com/albums/n117/Hunter2506/Machining%20projects/16f49265-3395-442c-9bd8-5836d0e488e2_zps8x0vsc1e.jpg That bipod might be a little short and lightweight. |
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Posted: 4/8/2015 1:20:03 AM EDT
[#20]
Tell me it was no accident the boss on the driver's side closely resembles a BFL.
Very cool project. |
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Posted: 4/8/2015 9:26:03 AM EDT
[#21]
Tell me it was no accident the boss on the driver's side closely resembles a BFL. Actually, it was. My intent was only to keep with the theme of semi-circular cuts along the straight edges. What it ended up looking like came to my attention after the fact. |
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Posted: 4/9/2015 2:16:47 AM EDT
[#22]
That came out very nice. Won't find another one like it, that's for sure!
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