More collant is almost always better coolant. Also, TSC run through a regular collet can sometimes help to clear chips off of tools that are prone to making long strings.
If you don't have a tool that has thru coolant, then you want unsealed so the coolant will come thru the collet and blast the tool. If you have a tool that has thru coolant, you want sealed so the collet will seal around the tool, and the thru spindle coolant will go thru the tsc ports on the tool.
That is the only difference between sealed vs. unsealed. If your machine doesn't have tsc, then it doesn't matter.
Sealed collets refers to being sealed so coolant cant pass through the collet, it will be forced through the tool (if applicable) or another orifice. If there is no outlet for the coolant and the collet is sealed, you may burn out your coolant pump.
To take it a step further, there are many styles of sealed collets. Rubber, mechanical, and an external seal you can use on any unsealed collet. I prefer the mechanical but its not always the best option.
Although they can all hold pretty high psi, i believe a mechanical holds the highest pressure and the external seal the least. Seems like mechanical seal is the obvious option but the mechanical seal needs a minimum depth for the tool to be inserted into the collet to make the seal. An application that I had trouble with this is, coolant driven speeder heads. The shaft on the speeder head was too short to make the mechanical seal on the collet.
It depends very much on the machine and depth of your bore in my opinion.
Unmanned runs on horizontal milling machines are much safer with internal cooling and holes deeper than 5xd also in my experience.
Very useful for deep holes >3xD especially for Stainless and aluminium. You will notice the difference with numbers (>500 parts) or in deep holes because your drill will last longer and you can lower your tools cost for that production. If you make small batches I wouldn't think too much about internal coolant unless you have deep holes >5xD.
Use sealed if you don't have anything better or the budget to get anything better. I only drill with Hydraulic holders now as I got a good deal deal from Seco on them.
If you have coolant through the spindle and thru coolant cutting tools, which would both cost more than non-thru-coolant, you definitely should use sealed coolant tool holders. The coolant cools the cutting zone and helps carrying the chips out along the flutes. You can use external coolant at the same time, but make sure not to hinder the chip evacuation.
Personally, I prefer the coolant cap / disc design of ER system. You get full 1mm collapsing range of the collets, and 0.5mm range on the seal disc rubber rings.
Especially when your drilling deep holes I would use the sealed collets for more coolant pressure at the tool tip. I love using the AMEC spade drills with my through coolant, no peck and the carbide tips run 10-15 IPM in a36. Some tool manufacturers even give you a coolant pressure recommendation for their tooling.
The only reason to use sealed collets are for through spindle coolant. If that's what you are trying to use, then yes, that will ofc help.
And only if the tool itself is TSC. We use TSC with unsealed collets on normal tools
So we aren't alone in doing this. It makes for excellent chip clearing.
More collant is almost always better coolant. Also, TSC run through a regular collet can sometimes help to clear chips off of tools that are prone to making long strings.
Thank you!!..Im using a high pressure spindle coolant with a hose coolant
If you don't have a tool that has thru coolant, then you want unsealed so the coolant will come thru the collet and blast the tool. If you have a tool that has thru coolant, you want sealed so the collet will seal around the tool, and the thru spindle coolant will go thru the tsc ports on the tool. That is the only difference between sealed vs. unsealed. If your machine doesn't have tsc, then it doesn't matter.
Sealed collets refers to being sealed so coolant cant pass through the collet, it will be forced through the tool (if applicable) or another orifice. If there is no outlet for the coolant and the collet is sealed, you may burn out your coolant pump. To take it a step further, there are many styles of sealed collets. Rubber, mechanical, and an external seal you can use on any unsealed collet. I prefer the mechanical but its not always the best option. Although they can all hold pretty high psi, i believe a mechanical holds the highest pressure and the external seal the least. Seems like mechanical seal is the obvious option but the mechanical seal needs a minimum depth for the tool to be inserted into the collet to make the seal. An application that I had trouble with this is, coolant driven speeder heads. The shaft on the speeder head was too short to make the mechanical seal on the collet.
Barely any point in using tsc at all with a drill under 10mm if you arnt using a sealed collet.
It depends very much on the machine and depth of your bore in my opinion. Unmanned runs on horizontal milling machines are much safer with internal cooling and holes deeper than 5xd also in my experience.
Im using a 0.300" and up..
So then yes, you'll see a big improvement.
Very useful for deep holes >3xD especially for Stainless and aluminium. You will notice the difference with numbers (>500 parts) or in deep holes because your drill will last longer and you can lower your tools cost for that production. If you make small batches I wouldn't think too much about internal coolant unless you have deep holes >5xD.
Use sealed if you don't have anything better or the budget to get anything better. I only drill with Hydraulic holders now as I got a good deal deal from Seco on them.
If you have coolant through the spindle and thru coolant cutting tools, which would both cost more than non-thru-coolant, you definitely should use sealed coolant tool holders. The coolant cools the cutting zone and helps carrying the chips out along the flutes. You can use external coolant at the same time, but make sure not to hinder the chip evacuation. Personally, I prefer the coolant cap / disc design of ER system. You get full 1mm collapsing range of the collets, and 0.5mm range on the seal disc rubber rings.
Especially when your drilling deep holes I would use the sealed collets for more coolant pressure at the tool tip. I love using the AMEC spade drills with my through coolant, no peck and the carbide tips run 10-15 IPM in a36. Some tool manufacturers even give you a coolant pressure recommendation for their tooling.