• We invite you to join UKWorkshop.
    Members can turn off viewing Ads!

Connecting rods of different diameters/threads

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

Deadeye

Established Member
Joined
21 Aug 2017
Messages
665
Reaction score
155
Location
Buckinghamshire
I want to connect an M8 threaded rod with a 6mm unthreaded rod.

To-date I've ended up either
1. grinding off the thread to make an approx 6mm core and then using a 6mm sleeve. Recently elaborated this by drilling and tapping the sleeve for a grub screw rather than glueing
or
2. glueing the 6mm into a threaded 8mm connector

Both suffer from poor concentricity, but I can't find a female/female connector liek the standard hex connectors but with different bores.

Other, more elegant ideas?
 

AndyT

Established Member
Joined
24 Jul 2007
Messages
12,030
Reaction score
499
Location
Bristol
How many do you need? Just the one, or is this the start of a production run? Not hard to make, on a lathe or drill press. Any preference for overall shape - cylindrical, square section, hexagonal?
 

Deadeye

Established Member
Joined
21 Aug 2017
Messages
665
Reaction score
155
Location
Buckinghamshire
Hi Andy

Just two in the first instance.
I don't have a metal lathe and my metal working is rudimentary at best, but I could try on the drill press I guess. Got to learn somewhere/time!
 

powertools

Established Member
Joined
7 Jun 2011
Messages
1,731
Reaction score
110
Location
Bedfordshire
The only thing I can think of is to buy some 6mm connecting nuts and drill 8mm hole half way through and tap an 8 mm thread in that half.
 

sunnybob

wysiwyg
Joined
11 Oct 2014
Messages
8,399
Reaction score
162
Location
cyprus
Buy a piece of 14 mm hexagonal bar.
Drill the 6 mm pilot hole all the way down it. turn it over and drill the 8 mm pilot hole as far down as you need.
tap both ends to suit. easy peasy.
If it needs to come apart again use blue loctite. If its there forever, use red loctite
 

gmgmgm

Established Member
Joined
29 Aug 2013
Messages
207
Reaction score
24
Location
Wiltshire

Latest posts

Top