Can my 4020 do this?

[MBX5]

I have a 1995 4020HT, 88HS control.

Can I do this:

http://www.youtube.com/watch?v=iO81YZsUc_4]Broaching a keyway Haas VF-7 - YouTube

Some other posts in the G-code forum were a bit leery of the thrust bearing...

Also - would the M19 spindle lock for tool change be sufficient for holding the tool in place? Mind you I would be looking for very shallow DOC such as .001"-.002"

Thanks

[Bob La Londe]

I have a 1995 4020HT, 88HS control.

Can I do this:



Some other posts in the G-code forum were a bit leery of the thrust bearing...

Also - would the M19 spindle lock for tool change be sufficient for holding the tool in place? Mind you I would be looking for very shallow DOC such as .001"-.002"

Thanks

4020 is a router? Just make a fixed mount fixed tools like broaches nd remove your spinde when doing something like that. No spindle bearings to worry about if the tool isn't mounted in a spindle.

[dertsap]

Some other posts in the G-code forum were a bit leery of the thrust bearing...

Also - would the M19 spindle lock for tool change be sufficient for holding the tool in place? Mind you I would be looking for very shallow DOC such as .001"-.002"

Thanks

should be fine , the tool is small so I wouldn't be concerned about the bearings , if it was to become a problem then the bearings would have be shot to begin with .
think about it in this sense ,the force it would take to snap a 1/2" carbide end mill would probably exceed the force needed to take those light cuts


.

[Bob La Londe]

I have a 1995 4020HT, 88HS control.

Can I do this:



Some other posts in the G-code forum were a bit leery of the thrust bearing...

Also - would the M19 spindle lock for tool change be sufficient for holding the tool in place? Mind you I would be looking for very shallow DOC such as .001"-.002"

Thanks

4020 is a router? Just make a fixed mount fixed tools like broaches nd remove your spinde when doing something like that. No spindle bearings to worry about if the tool isn't mounted in a spindle.

[dertsap]

4020 is a router? Just make a fixed mount fixed tools like broaches nd remove your spinde when doing something like that. No spindle bearings to worry about if the tool isn't mounted in a spindle.

4020 is a fadal milling machine

[dblox]

His point is still valid, are you able to mount some sort of fixture to the external casing of the spindle or otherwise mount the tool on the Z axis structure instead of mounted to the spindle? Would be as rigid as the castings, and no need to worry about spindle locking & orientation.

[dertsap]

no disrespect but I honestly don't understand the point , if a machine can't handle something as trivial as that then its not going to be capable of any kind of real machining . though fadal is not a machine that i am fond of , I do have a few years of working with them and I wouldn't have to think twice about performing a simple operation such as that

[dblox]

I'm no engineer but I thought the bearings inside a spindle were designed to rotate while the stresses were applied. It's not the total amount of force on the bearings, it's the fact that it's a static force?

[dertsap]

I'm no engineer either but I am a guy that has to make it work when i have to , I've seen spindles take some serious abuse every which way over the years and aside from bruised egos , all is ok when the dust clears , to my surprise the worst that I've seen done to a spindle was a spun coupler , I've seen bearings go enough times and that was only from use
in theory the idea can be picked apart but this is pretty straight forward stuff in my opinion but its all up to what a guy is comfortable with doing

.

[DareBee]

Could be done.
If you have a few to do, a Roto-broach is reasonably priced.

[daking]

We do it with ours. Haven't seen any detrimental effects.

[Delw]

If you peck drill big holes in steel broaching in alum isnt going to be a problem