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JCHannum
02-13-2010, 10:44 PM
Does anybody have a cross section of a 22 tip-off mount showing dimensions and angles of the groove? I am making a mount for a Remington No. 4 rolling block. I can reverse engineer what I have, but a sketch would be a help.

38_Cal
02-14-2010, 12:54 PM
No dwg, but use a 60* dovetail cutter, max width about .485", leaving a .020" flat at the top sides. Top of base to bottom of dovetail should be about .090" if my membry isn't too far off.

David

JCHannum
02-14-2010, 01:55 PM
Thanks David, that sounds good. I will take a test cut in a piece of scrap first, but that will give me a good start.

Rusty Marlin
02-17-2010, 11:56 AM
Still need the print?
I can fax it over to you tonight or scan it and e-mail.

Rusty

JCHannum
02-17-2010, 09:28 PM
Thanks Rusty, I was able to dope it out from Dave's information. For the record, I ended up with a 1/2" wide mount (That was what I had started with when I roughed it out.) The grooves ended up 1/8" from the top of the base to the bottom of the groove with a depth of 0.050" on each side.

Here is my billet aluminum no tap mount for the #4 Rolling Block. The front taps into a dovetail blank and the rear lump is a split clamp that holds on the octagon. Not elegant, but it should serve the purpose. Anodizing would improve it;

http://i320.photobucket.com/albums/nn351/jchannum/P1070532.jpg

que
02-18-2010, 09:38 AM
hey good job on that mount. really like to see a few more pics at diff angles if possible.

JCHannum
02-18-2010, 12:42 PM
Here is a top shot from the other side that pretty well shows the design. It is nothing particularly complicated. The scope rail is 1/2" wide and 7/16" high. I used standard TALR (That Looks About Right) engineering methods, starting with a1" X 1" aluminum bar and milling off the unecessary parts.

http://i320.photobucket.com/albums/nn351/jchannum/P1070534.jpg

The scope could be lowered by further thinning the rail, leaving the clamping portion raised, but I left clearance to operate the rolling block and hammer.

que
02-18-2010, 02:14 PM
thanks for the additional pic. I like the simple/functional design. I've been thinking about doing something similar that this yet using the peep mounting holes instead of a clamp design like yours.