Drilling M6 Grubscrew for nozzle throat It occured to me before looking at nozzle throats, that for the same cost as a heat break, I could get 10 grubscrews upto 60mm. I did google drilling grubscrews out, the methods were aimed at removal. How to secure a screw from turning without destroying the threads. would it be too hard to drill 30mm. https://reprap.org/forum/read.php?1,541913,541913#msg-541913 Fri, 17 Jul 2026 07:44:40 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,541913,544633#msg-544633 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,544633#msg-544633 thetazzbot General Tue, 11 Aug 2015 13:05:14 -0400 https://reprap.org/forum/read.php?1,541913,544420#msg-544420 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,544420#msg-544420 elwood127 General Mon, 10 Aug 2015 22:30:14 -0400 https://reprap.org/forum/read.php?1,541913,544233#msg-544233 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,544233#msg-544233
All my heater blocks have m6 threads.

This weekend i managed to make a nozzle. w00t. and it worked. w00t w00t]]> thetazzbot General Mon, 10 Aug 2015 12:24:19 -0400 https://reprap.org/forum/read.php?1,541913,543938#msg-543938 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,543938#msg-543938 Also an option would be using M5 threads.
Isn´t it enough "meat" for 1.75 filament without PTFE liner? ( and smaller cross-section for lower heat conduction, too )
-Olaf

I stand corrected. M5 inside the heaterblock, but M6 for the heatsink adaption, would be the best choice IMHO.]]> o_lampe General Sun, 09 Aug 2015 12:07:22 -0400 https://reprap.org/forum/read.php?1,541913,543790#msg-543790 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,543790#msg-543790
Quote
o_lampe
Don´t we use stainless steel because of it´s low thermal conductivity?
How much lower is it compared to hardened steel?
-Olaf

yes, however i am recently questioning recently exactly how much of a difference there actually is in practice using mild steel which is only double the heat conduction compared to stainless but still heaps lower than everything else]]> thejollygrimreaper General Sun, 09 Aug 2015 02:10:57 -0400 https://reprap.org/forum/read.php?1,541913,543783#msg-543783 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,543783#msg-543783 How much lower is it compared to hardened steel?
-Olaf]]> o_lampe General Sun, 09 Aug 2015 01:34:34 -0400 https://reprap.org/forum/read.php?1,541913,543780#msg-543780 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,543780#msg-543780 elwood127 General Sun, 09 Aug 2015 00:57:54 -0400 https://reprap.org/forum/read.php?1,541913,542122#msg-542122 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,542122#msg-542122 The Screws are A2/70 Stainless Steel, They have an indentation at the center of the hex inner, which should give me a precise start. If straight drilling is not successful I will check out heat process.
From now on I'm using 1.75mm hotends/abs only. It is recommended not to use ptfe, because it breaks down at 250deg right. a 3mm hole tapered filament side.]]> 3DS-QUAD General Wed, 05 Aug 2015 00:32:41 -0400 https://reprap.org/forum/read.php?1,541913,542105#msg-542105 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,542105#msg-542105
for all the grubscrews i drill i heat them up until they are red hot and let them cool in a pile on a piece of aluminum foil, i do this with both the stainless ones and black oxide ones, after that your average sharp HSS drill bit will go through it fairly easy
with "threaded rod" or "all Thread" it's almost potluck as to getting a straight piece however if the piece you need for a thermal barrier/heatbreak is around 30-35mm long the best bet is to drillout a grubscrew as they tend to be straighter and the threading on them is almost always much better]]> thejollygrimreaper General Tue, 04 Aug 2015 22:44:59 -0400 https://reprap.org/forum/read.php?1,541913,542019#msg-542019 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,542019#msg-542019
Here is what I have accomplished so far:

Use a retangular piece of aluminum, about 1/2 thick is good. Drill (halfway through) and tap it to hold the M6 stainless all thread rod piece.
Screw the stainless rod into the aluminum.
It is helpful if you can do all of the above without moving the piece on your drill press, so you should have your vise firmly attached to the drill press table.

Once it is in, you need to center drill the end of the rod. Since we're talking about a very small hole, drilling an even smaller hole then reaming it with the larger bit is recommended because the shredded stainless will gouge the rod and maybe even break the bit. Then you need to polish the inside using lapping compound.

Or you can buy these

[www.ebay.com]

but I'm with you... I like playing with the lathe and the mill at the local maker space more than I like shopping from china.]]> thetazzbot General Tue, 04 Aug 2015 16:31:28 -0400 https://reprap.org/forum/read.php?1,541913,542014#msg-542014 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,542014#msg-542014
It's not impossible to drill 30mm deep with a 4mm drill (assuming you will be using 4mm PTFE tube), but it is very difficult to do this so the hole remains in the center. Research peck drilling and also d-bits. If you use a regular twist drill, make sure it is new or sharpened properly. You may also want to drill undersize and then ream to size.]]> etfrench General Tue, 04 Aug 2015 16:20:10 -0400 https://reprap.org/forum/read.php?1,541913,541987#msg-541987 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,541987#msg-541987 3DS-QUAD General Tue, 04 Aug 2015 15:31:48 -0400 https://reprap.org/forum/read.php?1,541913,541953#msg-541953 Re: Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,541953#msg-541953 gmckee General Tue, 04 Aug 2015 14:48:52 -0400 https://reprap.org/forum/read.php?1,541913,541913#msg-541913 Drilling M6 Grubscrew for nozzle throat https://reprap.org/forum/read.php?1,541913,541913#msg-541913 How to secure a screw from turning without destroying the threads. would it be too hard to drill 30mm.]]> 3DS-QUAD General Tue, 04 Aug 2015 14:17:15 -0400