=20 In a message dated 25/10/2009, jcallen1@........... writes: For some time some PSN members were using hypodermic needles to build ink= =20 pens. You simply grind the point off and have a precesion tip that can= =20 then be connected to the reservoir using a capillary feed tube. We learne= d the=20 process from Howard who used this design back in the first Bay area=20 seismic station way before our time in the 40=E2=80=99s. I ran two drum= recorders back=20 around 1990 and Jan Froom currently has a display station at Bonfante Gar= dens=20 in Gilroy CA that has a permanent display he put together for them=20 Regards, Steve Hammond PSN Aptos, CA Hi James, =20 If you want to get ready supplies of fine SS hypodermic tubing see=20 _www.smallparts.com_ (http://www.smallparts.com) They have a very wide= range.=20 You can vary the flow rate by inserting a variable length of wire through= =20 the ink reservoir and into the capillary tube. It would probably be easie= r=20 to get fine Nichrome wire than stainless steel.=20 Alternatively, some companies used to make pens with a coarse tube to= =20 the reservoir and a fine 'nib' tube pushed into in the other end. There= are=20 only a limited range of hypodermic needles produced and some suppliers=20 refuse to supply non medics, or only sell in boxed quantities. =20 Regards, =20 Chris ChapmanIn a message dated 25/10/2009, jcallen1@........... writes:For=20 some time some PSN members were using hypodermic needles to build ink pe= ns.=20 You simply grind the point off and have a precesion tip that can= then be=20 connected to the reservoir using a capillary feed tube. We learned the= process=20 from Howard who used this design back in the first Bay area seismic stat= ion=20 way before our time in the 40=E2=80=99s. I ran two drum recorders back= around 1990 and=20 Jan Froom currently has a display station at Bonfante Gardens in= Gilroy=20 CA that has a permanent display he put together for them Regards,=20 Steve Hammond PSN Aptos, CA
Hi James,If you want to get ready supplies of fine SS= =20 hypodermic tubing see www.smallparts= ..com=20 They have a very wide range. You can vary the flow rate by inserting a var= iable=20 length of wire through the ink reservoir and into the capillary tube. It= would=20 probably be easier to get fine Nichrome wire than stainless steel.Alternatively, some companies used to make pe= ns=20 with a coarse tube to the reservoir and a fine 'nib' tube pushed into in= the=20 other end. There are only a limited range of hypodermic needles produced= and=20 some suppliers refuse to supply non medics, or only sell in boxed=20 quantities.Regards,Chris Chapman[ Top ] [ Back ] [ Home Page ]