[modeleng] Re: Mystery thread and blade speed
- From: "Jeff D" <jeffdayman@xxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 21 Nov 2007 15:01:09 +0000
I get excellent blade life (several years) with Starrett HSS bimetal blades
and 150 fpm in CR/HR steels and many other metals and wood, just FYI. My
bandsaw is a converted wood one, but has an all steel frame and was heavily
made by a small shop somewhere. I made a V belt step down transmission for
it to get 150 fpm. Never needed anything else - worked just fine right away
and has for 20 years now almost every day. Only changed blades about three
times.
I'd set up for 125-150 fpm at the low end.
Good luck, Jeff Dayman
>From: Harry Wade <hww@xxxxxxxx>
>Reply-To: modeleng@xxxxxxxxxxxxx
>To: modeleng@xxxxxxxxxxxxx
>Subject: [modeleng] Re: Mystery thread and blade speed
>Date: Wed, 21 Nov 2007 08:07:58 -0600 (GMT-06:00)
>
>Thanks for all the suggestions. I'm inclined to agree with the M5.5 or M6
>x 1.0 but something else has ocurred to me. The grubscrew on this gear is
>installed opposite the keyway, meaning that when run home the grubscrw will
>bugger the motor shaft, which I would like to avoid, so I'm going to
>dispense with trying to match this screw and tap for a new one over the
>keyway. Better to bugger the key than the shaft IMHO.
>
>The bandsaw conversion involves combining a 3/4hp/1725rpm motor and 20:1
>right-angle gearbox to give a 86rpm "motor" speed and then drive the blade
>via V-belt pulleys. It is probable that in order to achieve the speed
>steps I seek I'll end up building step pulleys from individual pulleys. My
>next task will be to make a final decision on what blade speeds I will
>want. With a 18tpi HSS blade my present bandsaw (a typical inexpensive
>Asian 4x6) will cheerfully cut virtually anything I throw at it at 220fpm
>(or so it says on the spec-plate) so I think that will be my base blade
>speed. At the moment I'm thinking 150, 225, and 275fpm. I know that
>slower speeds, as low as 50fpm, appear in blade speed guidelines but
>frankly I've been running at 220fpm for years and aside from slowing that
>for SS and such my blade life has been excellent.
>
>Regards,
>Harry
>MODEL ENGINEERING DISCUSSION LIST.
>
>To UNSUBSCRIBE from this list, send a blank email to,
>modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject
>line.
MODEL ENGINEERING DISCUSSION LIST.
To UNSUBSCRIBE from this list, send a blank email to,
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.
Other related posts:
