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Member postings for Pixel_Porpoise

Here is a list of all the postings Pixel_Porpoise has made in our forums. Click on a thread name to jump to the thread.

Thread: *Oct 2023: FORUM MIGRATION TIMELINE*
02/10/2023 17:56:52

Exciting, good luck with the inevitable gremlins!

Thread: Inverter help
19/05/2023 19:57:40

Here's the wiring diagram from my brook crompton motor cover:

wiring diagram.jpg

Thread: machine-dro kits
13/04/2023 21:43:46

Hello all, thank you for the helpful and informative replies!

I'm definitely on the same page as DrDave & SillyOldDuffer, much rather get on with using the machine and pay for someone else to have done the figuring out.

A question for those with modern style benchtop mills, do you use the z axis readout or mostly use the quill readout?

I've only used knee type mills and my little Taig mill so using the spindle for cutting depth seems a bit odd!

As we all like pictures, here's my little Taig, which does pretty well! But cranking the head every time i want to drill a hole really makes me miss having a quill.

dsc_3039.jpg

Thanks,
Pixel

13/04/2023 14:47:47

Has anyone installed a machine-dro "machine dedicated" kit?

I'm thinking about getting an SX2.7 and wondering if the DRO kit is worth the little bit extra over the individual parts, if it saves making brackets etc myself. But i've not found any experiences of them out in the wild.

Thread: Lathe Belts for 918 warco
19/01/2023 20:32:47
Posted by JasonB on 19/01/2023 06:56:52:

The Gates Polyflex belts are not hard to come by, the 710 is a bit more common than the 730 and can be had for under £20 and available without the wait

£22.25 after vat and postage

18/01/2023 22:34:31

5m710 which Amadeal sell for £18 at the moment and the 5m730 that I've seen for about £26 Inc p&p.

The holes for the motor on my lathe were drilled a bit low, so I've ended up using one of each as there's not enough adjustment to get it and the pulley in the right place for either belt to work nicely in all the positions 

Edited By Pixel_Porpoise on 18/01/2023 22:38:42

Thread: Thread with steep helix angle?
13/04/2022 12:58:40

Great photo Andrew! Thanks

13/04/2022 11:43:13
Posted by Hopper on 13/04/2022 11:25:28:

The pics linked to in the OP look like standard UNC taps were used. Looks like somewhere round 3/8 or 1/2" diameter but hard to tell with nothing in the pic to give an exact scale. BSW would give you the same pitch in most sizes as UNC.

EDIT: PS he says in a later post that the knurl wheel is made from 3/4" diameter drill rod so scaling off that in the one pic of a knurl wheel up against a tap, it looks like the tap could be as small as 1/4 or 3/8". Almost certainly UNC on that side of the pond. Looks too coarse for UNF.

You won't get much coarser threads than that in V form. High helix threads are more common in Acme or Square threads, eg the 1/2" diameter x 10tpi feedscrew on the topslide of many British lathes. Now, that's high helix angle. But you wont find it in V form threads unless maybe its a two or three start thead.

Edited By Hopper on 13/04/2022 11:31:20

Nice working out, thanks

Yes, I was googling leadscrew threads the other day which lead me down this train of thought, taps (when available) are a bit pricy for an experiment.

13/04/2022 11:34:00

I should have said in my opening post that I don't have an indexing/dividing head or rotary table, having a go at the tap method is an affordable experiment.

Posted by DC31k on 13/04/2022 10:36:13:

There is a compendium of thread data here in a spreadsheet form:

https://journeymans-workshop.uk/downloads.php

You can use it to calculate (an approximation*) of the helix angle (ha) of the threads.

ha = arctan(pitch/(2*major dia)

Note that it is easier to use the metric values of major dia. and pitch from the table. If you use imperial values, you have to convert tpi to pitch.

Sort the spreadsheet by calculated helix angle.

To me, the results were surprising: the lowest helix angle is something like 6" BSP - understandable because BSP is a constant pitch series above 1".

The steepest helix angle is 1/8-26 brass, which we normally think of as a fine pitch thread. Above that one is some very high number (greater than 20) BA threads.

Before I did this, my money would have been on 1/4 BSW as it is a coarse pitch for its diameter, but I was nowhere near.

* I believe helix angle is more correctly calculated at the pitch diameter, but for this exercise, we are only doing a comparison.

Just what I was hoping to find out, thank you! :D

Thanks for all the suggestions

13/04/2022 08:32:20

Hi all,

I quite like the idea of using a tap to create a rope knurl: **LINK**

Which got me wondering which thread has the steepest helix angle "built in", (that I can buy a tap of), hopefully the collective has some suggestions!

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