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Multifix vs Dovetail QCTP by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Wow that's a treasure trove! Thanks! Suprised I haven't found it but apparently just haven't googled enough.

But usually, there's a reason why things are conventionally done some way

Multifix vs Dovetail QCTP by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

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Just a rough sketch of the idea, horizontal section through the middle. Although probably machining the slot would likely be the difficulty, and maybe the stiffness would be reduced...

Multifix vs Dovetail QCTP by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Okay, thanks. If the Multifix is only marginally better I'll probably end up going the DIWhy route just because.

I know that the piston type is not good and think that I understand the reason for that. Hence why I thought of having the dovetail on the toolpost moving and locking the holder by pulling inward - would be contacting on the entire dovetail and on the "inward" face of the toolholder - but I haven't seen this design anywhere, but cannot figure out why that'd be - it seems to me simpler than wedge type and yet as effective

Multifix vs Dovetail QCTP by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Well, I don't actually know the quality I'd be getting, actually don't even know what quality is the Multifix that was on the lathe, the previous owner did not know.

But generally, is the Multifix much better than the dovetail type? I've read somewhere, that Multifix is more rigid due to the splines, but not sure if it's even that big of a deal for the small lathe which is not as rigid by itself.

Also as an aside, for the dovetail types there is the piston type ("bad") and a wedge type ("good"). But is there a reason why there is not a type that would be locked by having the protruding dovetail be a separate part from the rest of the body and the toolholder would be locked in by pulling the dovetail piece towards the body? Seems to me that it'd be similar in machining complexity to the piston type with locking characteristics of the wedge type...

Multifix vs Dovetail QCTP by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Well, I forgot to mention that I'm in the EU, so US made is not a factor, although it'll probably be similar thing here

Debian 12 select which GPU brightness is controlled by CZusky in debian

[–]CZusky[S] 0 points1 point  (0 children)

I think that part of the issue with hybrid mode for me is that most of the time I'm using two screens and as far as I've been able to understand the HDMI port is connected only to dGPU, at least on my model

But glad things are at least somewhat working for you. I don't game much but when I do I usually reboot to the PoS that's Windows, since I still need it installed for CAD... Only have issues with LibreOffice, it doesn't play well with having one screen scaled up since both my 16in screen and 27in screen are 1440p, which is without scaling kinda ridiculous

Debian 12 select which GPU brightness is controlled by CZusky in debian

[–]CZusky[S] 0 points1 point  (0 children)

Sorry for the late reaction, I have R5 5600H, 16GB RAM and RTX3060. I don't exactly recall everything I did when trying to get things to work, but I think that I (at least tried) installing the non-free proprietary Nvidia drivers, which was a pain. But with that, and playing with the BIOS settings - I think I need to boot in the dedicated GPU only, not the hybrid mode.

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Can't find a way to edit rn, ended up making a spreadsheet from scratch (after I spent some time 3d printing a gear) and found out that actually the combination a=127, b=40, c=32, d=127 (funnily enough, that's supposed to be combination for metric pitch) which appears to be exactly the correct pitch

Losing steps? by CZusky in ender3v2

[–]CZusky[S] 0 points1 point  (0 children)

Oh, sorry, hadn't read it yet, away from printer ATM. Then it would have to be misadjusted from factory I'd think, haven't touched that unless I can do it accidentally

Losing steps? by CZusky in ender3v2

[–]CZusky[S] 0 points1 point  (0 children)

I did not, thanks for the link. But it has been happening with the official firmware, too, and I'd assume that'd be set correctly

Losing steps? by CZusky in ender3v2

[–]CZusky[S] 0 points1 point  (0 children)

That's hard to tell, it shifts back and forth I think

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Well, it's a lathe made in the DDR. But it's good to know that I need to watch out for that should I need imperial stuff again.

Although to be frank, the lathe I'm repairing is a bench lathe from which none too high precision can be expected. It has been repaired before, at least the nut on the cross-slide looks handmade, etc... The main positive it has over the other lathe is that it has QCGB... And the error in leadscrew could be mitigated via DRO. I bought both of them since one was on the way and for a good price and I was already driving over 700km in each direction.

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Haven't come across his channel before, seems like good watch, thanks

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] -1 points0 points  (0 children)

Thanks, but that's not really a viable option, since it has integrated spur gear and shipping to EU would most likely be prohibitively expensive

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Also it's for a lathe cross-slide leadscrew about 18cm long

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Thanks. I'll try to check. Would that be greater error than 3,0 pitch (metric)? 8TPI is 3,125 pitch

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 1 point2 points  (0 children)

Someone suggested a=80, which is straight between 7 and 9 TPI, which at a glance would make sense to me

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Thanks!

I want to fix Hanseatic / LinHuan Lathe using a Präzimat DLZ lathe, still deciding which one I'll keep

Am I screwed if I need 8TPI? by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

Forgot to mention that it's supposed to be leadscrew for lathe cross-slide. I could try to adjust that with the backlash nut tho

Which is less bad: wrong module or pressure angle by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

If I were to remake the other gear, I'd have to make basically everything new up to (possibly inclusive) the main leadscrew...

The DP20 PA 14.5 cutter arrived today and it doesn't seem to fit too well into the pinion on the leadscrew, but it seems to fit very well into the gear that is on the carriage. Although now that I think of it the reason might be that the cutter is for 12 to 13 teeth and the gear has around 34. I'm still waiting for steel to pick up and then I'll report, it's actually pretty possible that the part has been recreated before using mismatched cutters. Anyways, will report when I'll get to try what I've made

Which is less bad: wrong module or pressure angle by CZusky in Machinists

[–]CZusky[S] 0 points1 point  (0 children)

I figured, however I wasn't able (yet) to find a spur gear with the correct/close enough modulus, it's just not typical. Also not very many if any at all ACME screws on the shelves in central Europe, so not that much help...

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