Gunsmithing E. Cohen, Dakota Scimitar 260 Medium Tac Build

#105
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Absolutely a good idea. I had a similar set up for painting motorcycle parts. 12' x 16' shed, 10-4' lights. And 4 inferred cureing lights, couple furnace fans and some 20" x 20" booth filters produced some damn nice paint jobs.
 
#107
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sab9259</div><div class="ubbcode-body">Is that a 2-door sport in the shop? I like your style Chad! </div></div>

l find myself snooping around the backround of pics too. He sees a truck, I see a comparator. Love those old school tools. Spent many hours in front of one of those measuring heights, angles, and verifying single flute cutter grinds.


Keep up the great work chad, love your posts,
Jason
 
#108
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Finally got my new fixture finished up for angled ports on the brakes. Seems to be working well. Finishing this up as we speak so that we can get color on the metal finally.

Was able to write an incremental drill cycle so that it automatically compensates for the angle/incline increase too.

Cool stuff!

Not too much longer doc.

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#110
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

I have seen a lot of machining in my time, lots of gun and knife related stuff. Some really cool stuff for the Army Corps of Engineers.
But, you have got to be one of the best I have seen! Hell, you just make it happen, like it is easy. Very cool.
 
#111
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Thanks.

Unfortunately, it didn't work as well as I'd hoped. I goofed on one little thing. The collet setup has a little thrust clearance that gave me fits yesterday.

As a result I scrapped one of the brakes. (Damn you Chakkah!)

Not to worry. I sorted out a fix for it yesterday afternoon. I just finished the replacement blank and am about to bore the ports again. I feel pretty good about it now.

Live and learn!

C.
 
#117
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Chad, you might have to experiment on how many ports you leave on top. I once had a varmiter with too many holes on the top and when shooting it would force the front of the rifle down severely, could not see the red mist in the scope.
 
#119
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RTK</div><div class="ubbcode-body">Chad, you might have to experiment on how many ports you leave on top. I once had a varmiter with too many holes on the top and when shooting it would force the front of the rifle down severely, could not see the red mist in the scope. </div></div>


There are no ports on top. Everything is symmetrical. I learned a long time ago about non symmetrical porting on rifle muzzle brakes. I know a lot of companies do it and guys have no issues. It's not been my experience however. I do my stuff at 2, 3, 4 and 8, 9, 10. 2/4/8/10 are on a 40* index for the bigger brake and 50* for the smaller one. This way I could use the same size ports without them getting too close to one another.
 
#124
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Chad, you sir have forgotten more on how to make cool stuff that most of us will ever know.

I look forward to the day I can send you another pile of parts. Thinking my next boom-stick will be in 260 Rem.

Carry on, have a wonderful new year!

Jason
 
#125
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Thanks.

It's tough to get good pics of stuff when its in the oven. I've still not figured out the settings for getting the lighting correct.

Anyways, were chipping away. We got 2 colors on her. More to come tomorrow!

Going home.

C.

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#129
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

So just a question but what do you use to put the elevation,windage, parralax, and magnification markings back on the scope/caps?
 
#132
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RADcustom</div><div class="ubbcode-body">I'm betting he hasn't pulled all the tape off yet. </div></div>

Youre probably right but it strikes me as weird to lay decals over your tape which is just going to be pulled off? Unless it was just for the photo op.
 
#133
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: flounderv2</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RADcustom</div><div class="ubbcode-body">I'm betting he hasn't pulled all the tape off yet. </div></div>

Youre probably right but it strikes me as weird to lay decals over your tape which is just going to be pulled off? Unless it was just for the photo op. </div></div>
I'm guessing black color fill.
 
#134
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

There's another way gents.

A half hour on the lathe and some quick work with a mouse/keyboard rewards me with this:

An engraving fixture:

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An engraving program:

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And finally, the finished part.

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This particular scope uses 1/4's for each index. 10 minutes per rev gives us a 36* index between the whole numbers. From here you just split those into 4 more segments for an absolute position of 9* between each tick mark. Stick some numbers in there, program to run across the A axis, and your set.

I should have done it in Old English "Vahto" font or "WingDings".
smile.gif
 
#135
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Your work is definitely top notch, you always come up with something new and outside the box.
 
#137
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

This has been so much fun I'm gonna have to think up something else to have Chad build ( .338 LM anyone?!).

There aren't a lotta virtues to being an old dude (me). One may be surviving long enough to educate my kids. Another may be having a few bucks put away to have a little fun with something I love.

Anyway I'm greatly appreciative of all the work Chad put into this.

Doc
 
#138
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Doc,

Thanks.

I once built a 300/338LM for myself. I put a 34" 13 twist barrel on it. It was throated for 125 Grain Ballistic tips. According to the test tunnel chronograph it was slinging lead at 4375fps. The SD was a little high (in the low 20's) but it performed well from day one.

110 Grain Sierra's were a little too much for old girl. On a squeaky clean barrel I could dip into the low 4400's but after about 10-13 rounds you'd see little "poofs" at about 60 yards.

Regardless, the 125's were just absolutely pornographic in a dog town.

Gun weighed in over 20lbs thanks to the Fibron laminate and extra lead shot packed in here and there. With the brake you could just watch the carnage unfold.

Buy your barrels by the pallet cause it's not nice to them. . .

Just an idea to ponder while balls deep into a <span style="font-style: italic">Trabeculae Carnea</span>.(I love Mexican food!
smile.gif
)

C.
 
#139
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Ah, Mexican. We'll have to figure a way to get you down here (Northern AZ). There's a restaurant in town called Elote: does a mix of Mexico City Castilian and just plain folks good food. I bet you'd love it.

As to the LM, we'll talk.

Have a great meal!

Doc
 
#140
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Watching the whole build has been fantastic. It's just pure quality from start to finish. The Scope has to be my favorite part, just because it was totally unexpected. Bravo to all involved. Time to put in some extra shifts and start socking away cash.
 
#144
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

DSC_0142.jpg


Very slick my friend. May have to have you coat one of mine like that some day. Need to just stop in next time I am through and catch up a bit.
 
#145
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Absolutely unreal. I'm not sure if I am more impressed with the result, or the work required to get there. Very few true Craftsmen left, but you appear to be the real deal.

Congrats to the builder and the owner!

Mike
 
#148
Re: E. Cohen, Dakota Scimitar 260 Medium Tac Build

Final assembly:

Couple little things to do. The extractor is making the bolt a little sticky...(dammit chakka!)

Sooo, we'll blast that off, polish on it a little more, and recoat. No biggy.

Kiddo forgot to coat the wedding band that holds the extractor on the bolt too, so we'll shoot that at the same time.

Couple little touchups here/there but by and large were done. Now to gas up some bulletz and wait for this alleged 50+ weather were supposed to get. Yesterday was a white out so getting to the range may prove interesting. (Spearfish canyon range can be a real biche after a snow storm.)

Were in pretty good shape. Pretty gun. Everyone that's seen it in person so far sure likes it.

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