Thread Mills

[SpecialtyTool]

Im looking for a stubby thread mill. Not a single point. Im doing a 1/4-20 x .254" deep in mild steel. Any recommendations?

 

Thanks

[JMahon]

Tried Harvey tool?

[SpecialtyTool]

Tried Harvey tool?

Yeah. I can only find them in 1/2" LOC there. I'd like to go as short as possible. These are for a specific job and .254" is the max depth they'll ever be used for. Seems like 1/2" is the standard

 

Thanks

[The Cathedral]

Threadmill USA has a double-end threadmill with a .350 LOC.

 

http://www.threadmillsusa.com/de_mills.htm

[MIL-TFP-41]

Since they don't have to be end cutting....how bout just cutting one off?

[htm01]

https://www.mscdirect.com/product/details/44062958  .371 LOC

[Rstewart]

^^^^^^^^^

Not trying to hijack, but

 

I'm so tired of MSC's pricing...

 

I mean It's totally highway robbery. 

[chris m]

We use Vardex threadmills, and I like them a lot, but their pricing is stiff

 

MSC is great for a onesie tool I need tomorrow, because they stock everything on Earth; otherwise, they suck.

 

C

[Tim Johnson]

We use Vardex threadmills, and I like them a lot, but their pricing is stiff

 

MSC is great for a onesie tool I need tomorrow, because they stock everything on Earth; otherwise, they suck.

 

C

We use Vardex threadmills also but if you compare price vs. performance I consider them to be rather inexpensive.

[The Cathedral]

^^^^^^^^^

Not trying to hijack, but

 

I'm so tired of MSC's pricing...

 

I mean It's totally highway robbery. 

 

Apparently the trick is to negotiate a contract with them, if you use enough volume of products to do so. While I can't say what we pay, I can say that what we pay is usually significantly less than the ridiculous numbers they put on their website.

[CR]

"Apparently the trick is to negotiate a contract with them, if you use enough volume of products to do so. While I can't say what we pay, I can say that what we pay is usually significantly less than the ridiculous numbers they put on their website."

 

 

DITTO

next day deliverd free shipping over $100.00

[htm01]

Apparently the trick is to negotiate a contract with them, if you use enough volume of products to do so. While I can't say what we pay, I can say that what we pay is usually significantly less than the ridiculous numbers they put on their website.

same here, we don't pay book on anything and its always next day

[specv]

same here, we don't pay book on anything and its always next day

Same here, the savings are significant if on contract. Think of the website pricing like retail price. 

[jeff]

Same here, the savings are significant if on contract. Think of the website pricing like retail price. 

 

We have a standard 15% off the prices on their site.

Not bad IMO

[Rocketmachinist]

same here, we always get free shipping, and dicounted pricing. Then you wait for a 30% sale and its not that bad.

 

I just hate it when I call a local company looking for stuff and nothing is in stock. So I'm usually sitting there for weeks waiting for a single item I was looking for.

[Machineguy]

We buy so much from MSC,  the salesman almost lives here.

When I buy tools for the shop, I make a list and call our rep, who give me a quote with our discount by email in just a few minutes.

 

Machineguy

[SpecialtyTool]

We ended up going with Lakeshore Carbide simply because of pricing until we get this process figured out. Its been a long time since I messed with threadmill programming. I have some questions about threadmilling with mastercam. I used to know how to write these out by hand and I thought the process was to roll into the thread, it looks to me like mastercam wants to feed straight to the wall of the thread then start the loop. What feeds and speeds would you run for a 1/4-20? Our spindle maxes out at 10000 but we try not to go that high as we've had spindle issues in the past on this machine. Below is the program from Mastercam. Does anyone have a proven 1/4-20 threadmill program? We need .254" of full thread.

 

Thanks

 

%
O0011
N100 G20
N102 G0 G17 G40 G49 G80 G90
N104 T27 M6
N106 G0 G90 G54 X0. Y0. A0. S8800 M3
N108 G43 H27 Z.25 M51
N110 Z.1
N112 G1 Z-.25 F10.
N114 G41 D27 Y-.1185 F23.
N116 G3 X.1185 Y0. Z-.2375 I0. J.1185
N118 Z-.1875 I-.1185 J0.
N120 X0. Y.1185 Z-.175 I-.1185 J0.
N122 G1 G40 Y0.
N124 Z-.25 F10.
N126 G41 D27 Y-.1235 F23.
N128 G3 X.1235 Y0. Z-.2375 I0. J.1235
N130 Z-.1875 I-.1235 J0.
N132 X0. Y.1235 Z-.175 I-.1235 J0.
N134 G1 G40 Y0.
N136 Z-.25 F10.
N138 G41 D1 Y-.125 F23.
N140 G3 X.125 Y0. Z-.2375 I0. J.125
N142 Z-.1875 I-.125 J0.
N144 X0. Y.125 Z-.175 I-.125 J0.
N146 G1 G40 Y0.
N148 G0 Z.1
N150 Z.25
N152 M5
N154 G91 G28 Z0. M9
N156 G28 X0. Y0. A0.
N158 M30
%
 

[specv]

First of all, your Entry/exit arc clearance is set to large, that is why you are not getting a roll-in arc.

Second, Your feed is a little extreme, calculate the actual feedrate at the edge of the cutter and your centerline feedrate should be about roughly 1/4 of what you have. But i don't know the diameter of your cutter so i can't calculate that for you.

[SpecialtyTool]

First of all, your Entry/exit arc clearance is set to large, that is why you are not getting a roll-in arc.

Second, Your feed is a little extreme, calculate the actual feedrate at the edge of the cutter and your centerline feedrate should be about roughly 1/4 of what you have. But i don't know the diameter of your cutter so i can't calculate that for you.

Thanks. My entry/exit arc clearance is set at 0.0. I have attach a screen shot of my lead in/out parameters. Its a .180" cutting diameter tool. I realized the feed was way too high. I think I should be running around 7427 rpm and about 5 ipm.

[SpecialtyTool]

Here is a screen shot of my multi pass parameters.

 

Thanks

[specv]

I guess i should have just said that the setting was wrong, not specifically to large, to large and it won't do an arc, 0 will also not do an arc.

play with the numbers to get a lead in.

[SpecialtyTool]

I guess i should have just said that the setting was wrong, not specifically to large, to large and it won't do an arc, 0 will also not do an arc.

play with the numbers to get a lead in.

 

Thanks. I think I got it worked out. Do I need to drop the RPMs when I drop the feed down to 1/4 of the calculated?

 

Thanks

[specv]

I wouldn't unless you are getting chatter.

[SpecialtyTool]

I'm still having a lot of issues with this threadmilling. They just keep snapping. I think the program looks good. We've increased it to 4 passes now. Taking about .011 per side on the first pass then .006 for 2 and a finish of .002. But we're not really getting through a hole. One broke today on the first pass. All I can think is the tool holder. Its a collet holder held in a cat40 tool holder secured with a set screw...extended about 4". At almost 7000 rpms it can't be too stable. Would a tool holder have that much affect? I've got one on order but it didn't show up today.

 

Thanks

[Mr. M]

Check your run-out. Any YES, a holder can/will affect it that much