B&S 2G Beginner -- Rapid Pull Out?

klpauba · Apr 15, 2018

Hi all.

I did a search but couldn't find anything about this topic.

In reading some B&S cam design documents, there's mention of "rapid pull out (rpo)" for deep drilling on B&S 2G machines.

I would like to know if there's a way to pull the turret out without indexing. This would allow me to peck a deep hole without adding more twist drills to the turret.

If it can be done, might you share how I can set up the machine to do so?

Thanks!

Limy Sami · Apr 16, 2018

Where's Camscan? .paging Mr Camscan.

klpauba · Apr 16, 2018

Thanks for the call out to camscan, Limy Sami!

I guess this is proof that my 2Gs won't support the RPO. At least I better understand how it works.

My solution will probably involve outfitting the turret with extra drill bits and indexing the turret. I gather this is faster than multiple cam lobes, right? Any real downsides (other than using turret capacity)?

I appreciate the effort you expended in answering my question, camscan!

camscan said:
Pics as promised,files too big from computer so taken off tablet. Can try again if you want.

DDoug · Apr 16, 2018

Wasn't there a posting showing a re-working of the brownie, by getting rid of the
main feed cam, and putting a servo motor in it's place ?

Limy Sami · Apr 16, 2018

For the record, what do you call deep drilling? .....please give dia' depth and material.

The reason I ask is, that from what little I know about cam autos and the guys that set them, is that when it comes to cutting parameters they sort of have their own rules, or ''bend'' what is considered normal practice, and very successfully at that! ............and with the range of drills available today, pecking can be greatly reduced if not eliminated altogether.

D.D.Machine · Apr 16, 2018

yes you can do it ,,, I have 5 or 6 sets of generic cams that I had made by Joe Wieter at national tool & cam co ..... the main can is set up for peck drilling and it just drops the drill out to the face of the part then rapids back in about .01 short of were it left off ...
the 2G indexes off the trip dogs and not off the cams ...

And here I thought I was the last guy running 2G machines ..

D.D.Machine · Apr 16, 2018

little OT

a good set of what I call Generic cams works great on the 2G machines ,,,, side cams are set for .600 rise and about .004 feed and the main cam is set for a feed stop, one center drill .400 rise and ,003 feed and then it has a peck drill with 1 1/2" rise and .004 feed I had then made for
1 thru 4 drill .... all are set up for 600 RPM .......

that works great of most steel parts ,,, for alum I just turn the spindle faster and for more parts per min ....

A 2G can be a vary simple to set up machine if you get your head wrapped around how they work ... there is 2 spindle speeds, forward and reverse , a front and rear slide and a turret that goes in and out at holds 6 tools ...

klpauba · Apr 26, 2018

The hole is V-size (roughly 3/8" DIA) and 1.875 deep (0.010 approach).

Limy Sami · Apr 26, 2018

klpauba said:
The hole is V-size (roughly 3/8" DIA) and 1.875 deep (0.010 approach).

That's only 5X D, ......I'm sure there are modern drills - such as parabolic flutes, that will go that deep without pecking.

klpauba · Apr 27, 2018

Thanks, I'll check out better drills.

klpauba · Sep 2, 2019

Sorry for getting back so late (I'm trying to catch up).

Your suggestion to go with a parabolic flute drill, Limy Sami, was a good one. Been drilling the holes in 12L14 very well.

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