Bottom tap,taper tap and plug tap?
- Thread starter Adonisy
- Start date
Bottom tap,taper tap and plug
> Basically,the only difference between plug and taper type taps is the number of threads that are ground away or chamfered at the very end. The taper type is the easiest to start off square,the plug type is the most common. Bottoming type taps are used for tapping closer to the bottom of a blind hole,meaning there is not a hole all the way through the part you are tapping. Other than different H limits,which is the amount of play the cutting edges of the tap allow inside the hole,there is practically no difference between taps used for cutting metal or wood threads. For example,an H2 tap for 5/16-18 threads is the basic diameter of the fastener to be used,in this case .3125,plus .0005-.001. In just about all cases for fasteners under 1 1/2,an H3 tap is most common. For applications such as large wood-screw/Acme type joint pins,H0 taps are available,this is a super tight,almost interference fit. Thread forming taps work a little differently,it pushes the material out of the way and forms it to the new shape rather than cutting the material away,thread forming taps are not of much use in cuemaking as far as I know. Tommy D.
> Basically,the only difference between plug and taper type taps is the number of threads that are ground away or chamfered at the very end. The taper type is the easiest to start off square,the plug type is the most common. Bottoming type taps are used for tapping closer to the bottom of a blind hole,meaning there is not a hole all the way through the part you are tapping. Other than different H limits,which is the amount of play the cutting edges of the tap allow inside the hole,there is practically no difference between taps used for cutting metal or wood threads. For example,an H2 tap for 5/16-18 threads is the basic diameter of the fastener to be used,in this case .3125,plus .0005-.001. In just about all cases for fasteners under 1 1/2,an H3 tap is most common. For applications such as large wood-screw/Acme type joint pins,H0 taps are available,this is a super tight,almost interference fit. Thread forming taps work a little differently,it pushes the material out of the way and forms it to the new shape rather than cutting the material away,thread forming taps are not of much use in cuemaking as far as I know. Tommy D.
