Drilling and tapping machine threads (M3 for example)
11-11-2011, 04:28 AM
#1
Senior Member
Thread Starter
Join Date: Mar 2005
Location: Kingston UK, but living in Athens, GREECE
Posts: 18,082
Likes: 0
Received 3 Likes
on
3 Posts
Drilling and tapping machine threads (M3 for example)
Hiya, nooby hardware question here, but for all my searching, I can't find an easy and straightforward answer, so maybe one of you guys can help me.
I want to drill and tap an M3 standard thread (as found in almost all our RCs) into a hardened alloy 17mm hex. I can easily find an M3 machine tap, my question is what drill bit should I use prior to the tapping? 2.5mm?
I want to drill and tap an M3 standard thread (as found in almost all our RCs) into a hardened alloy 17mm hex. I can easily find an M3 machine tap, my question is what drill bit should I use prior to the tapping? 2.5mm?
11-11-2011, 04:35 AM
#2
Senior Member
My Feedback: (325)
Join Date: Mar 2003
Location: LaGrange, OH
Posts: 14,857
Likes: 0
Received 0 Likes
on
0 Posts
RE: Drilling and tapping machine threads (M3 for example)
My chart shows
3mmx.5 uses #39 drill
3mmx.6 uses 3/32 drill
It's not going to be easy I don't imagine. 2.5 mm is probably just fine.
3mmx.5 uses #39 drill
3mmx.6 uses 3/32 drill
It's not going to be easy I don't imagine. 2.5 mm is probably just fine.
11-11-2011, 04:41 AM
#3
Senior Member
Thread Starter
Join Date: Mar 2005
Location: Kingston UK, but living in Athens, GREECE
Posts: 18,082
Likes: 0
Received 3 Likes
on
3 Posts
RE: Drilling and tapping machine threads (M3 for example)
Yeh, to be honest, I don't need it to have the full 60% or more thread contact, it won't be load bearing (at least not in the push/pull direction, load on the screw will be from the side). Thanks.
11-12-2011, 01:24 PM
#5
Join Date: Sep 2006
Location: Midlands, UNITED KINGDOM
Posts: 8,217
Likes: 0
Received 0 Likes
on
0 Posts
RE: Drilling and tapping machine threads (M3 for example)
11-12-2011, 01:50 PM
#6
RE: Drilling and tapping machine threads (M3 for example)
ORIGINAL: lee172
Good quality taps are out there... [8D]
http://www.rc-mushroom.com/product_i...ducts_id=20499
Good quality taps are out there... [8D]
http://www.rc-mushroom.com/product_i...ducts_id=20499
[link=http://www.amazon.com/Reid-Select-TU-TT93017-Thds-3-Flute/dp/B002P4XAO2/ref=sr_1_3?s=hi&ie=UTF8&qid=1321134426&sr=1-3]Here[/link] is a Reid for less than half what the Tamiya (actually looks to be Hansen) costs.
