Difference between R8 and Morse Taper Holders

[12six]

Hello everyone, sorry for the nubie question, but I was looking for a end mill holder to purchase, and just found out that there is a R8 end mill holder with the draw bar size of 7/16" 20 and a Morse Taper end mill holder with draw bar size of 3/8" 16 Wanted to know what the difference in the two holders. End mill holders are for a Harbor Freight 33686 http://www.harborfreight.com/cpi/cta...emnumber=33686

Thanks,
Charles

[Splint]

Originally Posted by 12six Hello everyone, sorry for the nubie question, but I was looking for a end mill holder to purchase, and just found out that there is a R8 end mill holder with the draw bar size of 7/16" 20 and a Morse Taper end mill holder with draw bar size of 3/8" 16 Wanted to know what the difference in the two holders. End mill holders are for a Harbor Freight 33686 http://www.harborfreight.com/cpi/cta...emnumber=33686 Thanks, Charles

R8 is a different design and relies on a drawbar to hold it in the spindle, morse taper is held in the spindle by the friction alone on the tapered surface. I have never seen a R8 work loose while in opperation but have seen morse tapers work loose on many occasions. Dont be put off morse taper by what I have said here but given the choice I would go with R8.

[12six]

Originally Posted by Splint R8 is a different design and relies on a drawbar to hold it in the spindle, morse taper is held in the spindle by the friction alone on the tapered surface. I have never seen a R8 work loose while in opperation but have seen morse tapers work loose on many occasions. Dont be put off morse taper by what I have said here but given the choice I would go with R8.

Thanks for the reply. I am using a mt3 chuck, and it is coming off as it is. I guess I can remove the morse taper holder from the list.

Thanks again,
Charles

[TOTALLYRC]

Originally Posted by 12six Thanks for the reply. I am using a mt3 chuck, and it is coming off as it is. I guess I can remove the morse taper holder from the list. Thanks again, Charles

Your machine has an R-8 spindle. You can't put a morse taper tool holder into a r-8 spindle and vise versa. To do so will destroy something.

For your machine you will need to buy R-8 tooling only or get a set of R-8 collets if you don't have them already and then you can hold just about anything. A good set of R-8 endmill holders is a nice addition and they will allow you to maintain the same z height every time the tool is removed and reinstalled.

If you are using a chuck, and it is probably has a Jacobs taper, they will come off because it is not designed to be side loaded as in milling but to be vertically loaded as in drilling.

I hope I understood what you were asking and you understand what I said.

Welcome to the wonderful world of machining and remember, we were all nubies once.

P.S. As you saw a morse taper can have a drawbar depending on the machine and tooling will not fall out when it is held in this manner.

[12six]

Originally Posted by TOTALLYRC Your machine has an R-8 spindle. You can't put a morse taper tool holder into a r-8 spindle and vise versa. To do so will destroy something. For your machine you will need to buy R-8 tooling only or get a set of R-8 collets if you don't have them already and then you can hold just about anything. A good set of R-8 endmill holders is a nice addition and they will allow you to maintain the same z height every time the tool is removed and reinstalled. If you are using a chuck, and it is probably has a Jacobs taper, they will come off because it is not designed to be side loaded as in milling but to be vertically loaded as in drilling. I hope I understood what you were asking and you understand what I said. Welcome to the wonderful world of machining and remember, we were all nubies once. P.S. As you saw a morse taper can have a drawbar depending on the machine and tooling will not fall out when it is held in this manner.

OK, that made things alot more clear. Just got the machine a few days ago, thought something was wrong with the spindle, but I guess I have to get the R8 End Mill holders.

Thanks,
Charly

[TOTALLYRC]

I made the same mistake only a few years ago. Glad to help.
Mike

[mc-motorsports]

R8 tool holders are much more common, plus you can use collet holders. You may find it's much more expensive to find a morse taper endmill holder, to where as R8 endmill holders are readily available at any tool shop.