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end mills for 80% lower build?

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#22 ·
ShmUDE said:
I bought some end mills to finish an 80% lower and found out they aren't long enough. They were 3" and i didn't factor in how far up the mill they go and how tall the top plate is on the jig.

I was looking to get a 4" 3/8 end mill and boy are they expensive!
3/8 Inch Diameter, 1/2 Inch Length of Cut, 4 53416038 - MSC

i saw that billet80 had a kit but it turns me off when they hit you with 14$ shipping charges.

so who has a better idea? buck up and buy what i need? or are there cheaper alternatives out there?
Click to expand...
Just call me and i'll hook it up on shipping.
 
#23 · (Edited)
#24 ·
#26 ·
rocket flier said:
Oh shit, good catch. Fewer flutes in aluminum where chip clearing is needed. Back to searching.
Click to expand...
if you have a router with a 1/2" collet, any reason to not step up to a larger end mill?
 
#27 ·
Machinist here with 8 completed 80 percenters lol.

You should be using a 2 flute.

Also a 4 inch endmill is going to chatter like a mother. I used a 3 inch loc (length of cutter) 3/8" and it was pissed about so much cutting edge. A bigger diameter cutter would deal with it better obviously.

I know use a 1/2 2 flute carbide that has the standard loc...1 inch or so? Just make several passes and go deeper each time. I pre drilled the slot so there wasnt much material there anyway but its too much for such a long cutter to take without making a mess of the inside, manually of course.
 
#28 ·
Don't use MSC. They're not a bad company but if you don't get the volume discount they're expensive as shit. You're better off buying from eBay.

If you don't have a variable speed router then I'd stay away from large endmills. Routers are usually too high of an RPM for them. We run solid carbide 4 flute EM's in Alum at about 3000 R's and 4000 for coated 3 flute.
 
#29 ·
WeTooLowBangDingOw said:
Machinist here with 8 completed 80 percenters lol.

You should be using a 2 flute.

Also a 4 inch endmill is going to chatter like a mother. I used a 3 inch loc (length of cutter) 3/8" and it was pissed about so much cutting edge. A bigger diameter cutter would deal with it better obviously.

I know use a 1/2 2 flute carbide that has the standard loc...1 inch or so? Just make several passes and go deeper each time. I pre drilled the slot so there wasnt much material there anyway but its too much for such a long cutter to take without making a mess of the inside, manually of course.
Click to expand...
where did you get it? do you have a link?
 
#32 ·
surpip said:
link to the amazon bit?
The one 80% sent me has a chip on the end of one of the flutes, it chatters a lot. If they dont send me another on ill need to buy some more.

How much depth are you feeding per pass with the router?
Click to expand...
Kodiak Cutting Tools KCT136475 USA Made Solid Carbide End Mill, Long, 4 Flute, 1/4" Shank, 1" Length of Cut, 4" Overall Length, 1/4" Diameter: Fast Spiral Threading Taps: Amazon.com: Industrial & Scientific

For the total depth of of the control group (however much the depth ended up being) I ended up doing around 12 passes. They more or less averaged out with the first and last pass being shallows than the rest.
 
#33 ·
Titan28881 said:
What size end mills are needed? I have some stuff im willing to part with pretty cheap.

EDIT - AR-15 Jig Tool Kit

3/8 drill
19/64 drill
5/32 drill

but didnt see and end mill size.
Click to expand...
Their instructions have the specs for the mill bit they sell.

It's a 4" OAL, 1/4" shank, 4 flute with 1" of cutting depth. The same exact specs as that Kodiak from Amazon. I haven't examined the two up close, but it may be a Kodiak from modulus.
 
#34 · (Edited)
surpip said:
if you have a router with a 1/2" collet, any reason to not step up to a larger end mill?
Click to expand...
The blueprints call out .218 radius in the fire control pocket. That's a 7/16" mill. Anything 7/16ths and less following the template will form the pocket to that spec. Additionally, the trigger slot is .312 so the 1/4" basically took care of everything considering routers typically have 1/4 and/or 1/2" collets.

As has been mentioned, there's more than one way to do this. Drill the corners first, then you don't care. Tough to get that dead on in the hackashop.

The thought of using my 3hp router to run a 1/2" mill in aluminum gives me pause for thought. I'm pretty sure if it catches, it's going to wind me up and throw me across the shop before it ever stalls.

Now I do have another smaller router with 3 sizes, and that made me think that maybe you can after market 3/8" collets. Quick search find them for several manufacturers.


Image

Image
 
#36 ·
M.Martian said:
Kodiak Cutting Tools KCT136475 USA Made Solid Carbide End Mill, Long, 4 Flute, 1/4" Shank, 1" Length of Cut, 4" Overall Length, 1/4" Diameter: Fast Spiral Threading Taps: Amazon.com: Industrial & Scientific

For the total depth of of the control group (however much the depth ended up being) I ended up doing around 12 passes. They more or less averaged out with the first and last pass being shallows than the rest.
Click to expand...
That's a 4 flute, thought you said use a 2 flute?
80% sends a 3 flute.
 
#37 ·
#40 ·
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Titan28881
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