R8 or MT3
- Can someone explain the advantages for/against the 2 respective spindle tapers: R8 or MT3?Another question regarding collets. If one purchases an ER Collet set and Collet Chuck for the milling machine, why would it be necessary to buy a Lathe Collet Chuck? Surely the MT3 milling collet chuck could be used in the lathe spindle, could it not?Many thanksGordon
- Thanks everyone for your comments and advice.I guess I will be going the R8 route, for several reasons, the main one being it will be more beneficial to the mill spindle/bearings.Also, I feel that using ER32 collets I wouldn't have need for using a drill chuck.Regards to allGordon-------Original Message-------From: Charles MortimerDate: 05/05/2009 09:03:14Subject: Re: [X_Series_Mills] Re: R8 or MT3good on you Terriyou are quite right r8 need to be taped if they are done up properly ... a light tap will release not like a Morse taper or a Jacob's taper which are designed to hold ... and they require a hefty blow to release ... i use both styles r8 in the mill and mt4 in the lathe head and the mt4 require a hefty blow from a dead blow hammer and the r8 in the mill require a tapCharles----- Original Message -----From: terinow55Sent: Tuesday, May 05, 2009 10:43 AMSubject: [X_Series_Mills] Re: R8 or MT3
When I worked (as a machinist who did my own set-ups) in machine shops during my college years everyone, at three different shops, myself included had to tap the R8 collets/holders out of the Bridgeports. They were well maintained/treated machines. The general opinion (in the Midwest of USA) was if the collet/holder would just fall out you didn't tighten it up enough which could lead to damaged collets and spindles. I have noticed many users of R8 spindle hobby machines making the case for the collet not needing to be tapped upon removal, which I always assumed was due to the fact they didn't need to tighten the drawbar much, due to the small size/weight of the machine leading to chatter, etc., before the mill, etc. would spin free due to the drawbar not being tight.