Gunsmithing rotary table and chuck question

[shadow_sniper]

Yall may have seen my on going stock project. well I finally saved up enough money to buy a rotary table with the hopes I can use it to cut the opposing 45 degree angles with some accuracy. Is the possible? If it is how do you suggest, I mount my part to my rotary table? 3 jaw self centering, 4 jaw, or something else? Do I need a tail stock or the other end or can I use something like a 123 block to support the end and then use a step block clamp thing to hold down the top? I would much rather use a rotary table than a sine plate because i think i will get more out of the rotary table than the sine plate in the end.

 

[WesP]

Re: rotary table and chuck question

what do you mean by opposing 45 degree angles?

 

[shadow_sniper]

Re: rotary table and chuck question

I want to cut 2 opposing 45 degree angles down the center of the on the piece to center the action. Like you see on many bedding block and the I believe the AICS. Does that make it clearer?

 

[AWGunS]

Re: rotary table and chuck question

You can't tilt the head of your mill to 45 degrees? That would be the easiet way.

 

[AJ300MAG]

Re: rotary table and chuck question

You could have jigged it in a couple of "V" blocks.

 

[shadow_sniper]

Re: rotary table and chuck question

I can tilt the head but I am using a mini mill. I only dont have enough travel in the Y axis to the cut angle in one pass.

Could you explain that more or show me a picture please? That would as ALOT cheaper.

 

[AJ300MAG]

Re: rotary table and chuck question

The V blocks have to be deeper than the thickness of the part. Line up two "V" blocks on your table, set them apart so they span the length of your part. Lay your block in the V block.
Place a piece of round stock so that it rests on the side of the V, at the same time the side of your part. Clamp the round stock with a strap on each V block. That will be enough to hold your part while you make the cuts. Flip the part, cut the other side of the V. The V in your part should be central.

Not bustin your chops, milling is like putting together a puzzle or playing a chess game. You have to look at the part and the print, figure your moves ahead of time keeping mind how you'll hold the part. Those cuts you made on the ends limits how you can now hold the stock. Odds are they could have been made as the last cuts.

 

[AWGunS]

Re: rotary table and chuck question

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cm92</div><div class="ubbcode-body">I can tilt the head but I am using a mini mill. I only dont have enough travel in the Y axis to the cut angle in one pass.

Could you explain that more or show me a picture please? That would as ALOT cheaper.</div></div>

2 setups then, per side...

 

[AWGunS]

Re: rotary table and chuck question

delete

 

[Wild_Bill]

Re: rotary table and chuck question

get hold ap a mill that has the correct length of travel and use an angled cutter you can use carbide router bits to cut the v Block we use them all the time the 120 degree cutter will do it other wise cut as far as you can and slide the piece throught your vise and re set it with a soft face mallet and finish the cut this is a better way turning the job is not a way i would do it as you will likley have more run out than moving the job in a machine vise.

 

[300sniper]

Re: rotary table and chuck question

if i had that part and <span style="font-style: italic">wanted</span> to use a rotary table to machine the vee, i'd start by drilling the mounting holes in your part. then i'd put a piece of round stock between the rotary table and a tailstock and dial it in. i would then machine a flat spot on the round stock long enough for your part. after that, i would drill holes in the round stock matching your part's hole pattern. the part would then be bolted to the round stock and chips would be made.

i don't necessarily think the rotary table is the best way to go about it but it can be done. i fully understand wanting to use something just because you have it or wanting to justify buying a new tool.

 

[toolmaker]

Re: rotary table and chuck question

This is a simple machining operation, dont make it over complicated. Get yourself a sine vise. Its very versitile, you wont need special cutters and you will probably get more use out of it than a rotary table.

 

[AJ300MAG]

Re: rotary table and chuck question

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">i don't necessarily think the rotary table is the best way to go about it but it can be done. i fully understand wanting to use something just because you have it or wanting to justify buying a new tool.</div></div>

I program/run a 4 axis CNC mill. Too much set-up work to do a single part like this on the rotary head...

 

[WesP]

Re: rotary table and chuck question

search MSC for an endmill called a drill mill. its basically an endmill with a point its great for quickly milling angles

 

[shadow_sniper]

Re: rotary table and chuck question

300sniper its not that I really want a new tool. I would much rather spend the money else where, but if I need a new tool then I figure I should get the the tool I will get the most use out of. I dont see very many uses for a sine table but I can see alot of uses for a rotary table. Im not really worried about set up time. This is home project so Im not really racing to get it done.

 

[Clark]

Re: rotary table and chuck question

This is my rotary table being used for cutting extractor relief on a barrel breech. It is very heavy to lift onto the mill table.

I would think you could get an accurate 45 degrees on a bedding block using a sine bar.

Thursday I was cutting an accurate 5 degrees with a sine bar for a custom scope mount to go on a 91/30.