topic Re: problem making threads in Fusion Manufacture Forum

problem making threads

rajsumanth9 — Thu, 25 Jan 2024 06:33:40 GMT

Hello Everyone,

I am currently working on creating a thread for a screw with a diameter of 0.15 inches. Could you advise on the optimal hole diameter for this screw size? Additionally, what would be the appropriate thread diameter to ensure a proper fit?

Thank you in advance for your assistance.

The following is the thread endmill that I am using.

Maximum Threads Per Inch 64
Minimum Threads Per Inch 40
Material Solid Carbide
Thread Type Internal; External
Thread Size #4-40 - #4-64
Shank Diameter (Inch) 3/16
Cutting Diameter (Decimal Inch) 0.0800
Overall Length (Decimal Inch) 2.0000

this is the thread mill link https://www.mscdirect.com/product/details/57568750?rItem=57568750

Re: problem making threads

a.laasW8M6T — Thu, 25 Jan 2024 07:26:08 GMT

So do you already have a Screw that is .15" diameter and you want to thread mill a hole to suit?

Diameter alone is not enough info we would also need to know TPI as that dictates the minor diameter and pitch diameter offset values.

The question is why are you using a non standard thread?

.15" doesnt match any standard UN thread, if you are measuring with calipers on an existing bolt this seems closer to an M4 metric thread.

6-32 is 0.138"

8-32 is 0.164"

Re: problem making threads

damianvox — Thu, 25 Jan 2024 19:15:20 GMT

Hi a.laasW8M6T,

I am collaborating with Raj, the original commenter, on the threading issue we previously discussed.

We did what you suggested and attempted using an 8-32 size, which corresponds to a diameter of 0.164 inches, and it appeared to be a step in the right direction – the screw seems to fit. However, we're encountering a new challenge: the threads are not engaging properly, preventing the screw from being fully inserted and secured.

We are utilizing M4 x 10mm Cup Point Set Screws. Considering the ongoing issue, we are beginning to suspect that the type of endmill we're using might be contributing to the problem. Here are the specifications of our current endmill:

Maximum Threads Per Inch: 64
Minimum Threads Per Inch: 40
Material: Solid Carbide
Thread Type: Internal & External
Thread Size: #4-40 to #4-64
Shank Diameter: 3/16 inch
Cutting Diameter: 0.0800 inch
Overall Length: 2.0000 inch

https://www.mscdirect.com/product/details/57568750?rItem=57568750

https://a360.co/47NXanQ

I am eager to hear your thoughts on this. Could the endmill type be the root cause of the threading issue, or might there be another factor at play? Any insights or suggestions you could offer would be immensely valuable.

Thank you for your time and help.

Damian

Re: problem making threads

programming2C78B — Thu, 25 Jan 2024 19:27:54 GMT

.7mm/ 32tpi are all outside of the range of that tool. I doubt the flute is wide enough to get a full thread profile with it

Re: problem making threads

a.laasW8M6T — Thu, 25 Jan 2024 19:38:46 GMT

Yes indeed, as above both of those threads cannot be cut by that thread mill.

Why not just tap it? taps are waaay cheaper than threadmills

Re: problem making threads

damianvox — Thu, 25 Jan 2024 19:58:56 GMT

Thank you. This should fix the problem.

Re: problem making threads

damianvox — Thu, 25 Jan 2024 19:59:18 GMT

We did consider that. I have a CNC machine, and I want to do it with it. I do see your point, though. Thak you very much.

Re: problem making threads

damianvox — Thu, 25 Jan 2024 20:33:23 GMT

This is probably an obvious answer, but I am somewhat new to CNC and, specifically, threading. Would you say that this is the end mill I should have acquired in the first place for the threads in question?

Maximum Threads Per Inch 64
Minimum Threads Per Inch 32
Material Solid Carbide
Thread Type Internal; External
Thread Size #6-32 - #6-64
Shank Diameter (Inch) 3/16
Cutting Diameter (Decimal Inch) 0.0980
Overall Length (Decimal Inch) 2.0000

Re: problem making threads

a.laasW8M6T — Thu, 25 Jan 2024 20:45:27 GMT

Yes that could machine the 6-32 or the M4x0.7

You probably cannot tap in a Pocket NC mill I'm guessing?

Re: problem making threads

damianvox — Thu, 25 Jan 2024 21:09:05 GMT

Thank you for making my day! Unfortunately, I cannot tap it on this machine. You and the other gentleman have been incredibly helpful.

Please let me know if there is anything I can do for you guys.

Thank you so much.

Re: problem making threads

programming2C78B — Fri, 02 Feb 2024 15:16:34 GMT

Damian I just got your message and have responded. Check your inbox here on the forums.

Re: problem making threads

damianvox — Fri, 02 Feb 2024 16:18:32 GMT

Hi, I do not see that option ( I am new here). However, I think the original commentator needs to do that. Maybe ?

Re: problem making threads

programming2C78B — Fri, 02 Feb 2024 16:31:52 GMT