I used to make needles with a jig but you're limited to one geometry.
Now that I got used to using the tool & cutter grinder for making embossing cones I thought I'd use it for needles too.
Step 1: Parting off on the Clarkson T&C grinder
Step 2: Cutting the locating face on the Tiplap T&C grinder
Step 3: Clocking the needle in the holder (Colchester Bantam lathe).
Step 4: Setting the face angle. Here to 35.5 degrees for a full angle of 71 degrees (Quorn T&C grinder).
Step 5: Roughing the first side.
Step 6: Roughing the second side.
Step 7. Polishing the first side.
Step 8. Polishing the second side.
Step 9. Deburring the cutting face (Colchester Bantam lathe).
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Step 10. Polishing the cutting face.
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Upside... you can make anything. Downside... takes about 10X as long to do as with a jig. Just the visual inspections are time consuming.
Each cutting op needs 3 inspections per cut. One to check its roughly right. A second to check its going right & a third to see that it completed right. And that's if everything goes as planned. That's 24 visual inspections per needle.
Still... the results compared to what I was doing are in a totally different league.
I've got a lapping disk that I could charge with sub micron diamond paste for 'super finishing' but no point doing that till I know these actually work.
Just because they look good means nothing. They could look good & the geometry could be crap & they might not work at all.
We shall see I guess.</div>
How I make needles now... this time, with pictures!
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- farmersplow
- Posts: 371
- Joined: Thu Jun 17, 2021 3:43 am
- Location: Austria - Vienna
Re: How I make needles now... this time, with pictures!
Very very cool!!!
Re: How I make needles now... this time, with pictures!
Thanks!
Your project is considerably cooler though....