Reaming Speed???

[Sai]

I have to Ream a piece of steel table on a CNC HAAS machine. What would be the ideal speeds and feeds for Reaming a 5/16 hole 1.2 inch deep.

I used 1000 rpm for drilling. Should I go faster than 1000 rpm since Reaming is a finishing operation? Also what about the feed, I used 5 inch per min feed for drilling.

[PGW Steve]

HSS or carbide/tipped? What type of steel and how hard?

[Sai]

Tool is HSS and work piece material is some kind Mild Steel.Its not too hard. Drilling was pretty easy using HSS drill bit Its a table to be used for a welding robot.

[Müřlıń®]

prol a 250-350RPM and feed fast@ 10-20 IPM with oil

[chris m]

Wow that's a lot of feed!!

 

I'm thinking 250 RPM @ 3 IPM

 

C

[Tom Szelag]

I'd go slower on reaming than on drilling since its finishing and you don't want to generate much heat. But then again you're taking off so little that might make up for it.

 

I'd start at 600rpm / 5ipm to start with for a 4-flute reamer, cooled, and work upwards from there. Better to start slow and work up than to start fast and scrap parts.

[PGW Steve]

.3125 dia.

25 sfm = 306 rpm

3.66 ipm = .002"/flute based on 6 flute

[Tom Szelag]

I'd think you could definately do 50sfm reaming mild steel. I assume you drilled .3020?

[Psychomill]

I'm with Merlin and Tom on this one.... I start at 800-1000rpm and 10-15 IPM feed with coolant. Hell, I start at that with SS.

 

[Fred @ Slate Industries]

I'm oldschool too

Oil, Low rpm, 3.0/5.0 ipm , 0 spindle load...

Feed on the way out Not Rapid like G81

[Thad]

quote:

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I'm thinking 250 RPM @ 3 IPM

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I'm with Chris on this one.

 

Thad

[Sai]

The hole size I drilled is Size M i.e 0.2950. Hope it is sufficient

[Fred @ Slate Industries]

Thats fine the reamer needs something to cut

[Allan]

The rule of thumb I was taught in my apprenticeship days was half the speed(rpm) and twice the feed(ipm).

 

Allan

[Jack K]

Wow............

I am old school too, I would use 200 rpm % 2.500imp..... old timers always said you should be able to see the flutes while it's turning.

[Müřlıń®]

quote:

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The hole size I drilled is Size M i.e 0.2950. Hope it is sufficient

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.005/.01 per side is what I always used, so you look good.

 

The reason for faster reaming feeds is so that the top of the hole won't bell mouth if you have a little runnout, the reamer will follow the hole.

 

If you are looking to hold a finish, you might slow feed down a little and make sure your reamer is indicated in to hold size. If you just need to hold size, feed as fast as possible.

 

Murlin teh old school

[Kevangel]

Lower RPM will give smaller hole, higher RPM will cut bigger as a general trend. I would run that part at 250 RPM and 8 IPM and liberal cutting oil....(reamers have more cutting edges than a drill)

[Psychomill]

I guess Merlin and I run them a little fast for some....

 

How 'old school' is old school? I've been running reamers that way since the early '80s.

 

 

quote:

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Lower RPM will give smaller hole, higher RPM will cut bigger as a general trend.

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Likewise, the rule applies to feed as well. Slow the feed down some, hole is bigger. Kick the feedrate up, hole is smaller.

 

If all else fails, and the hole is still small (and you don't have or can get a bigger reamer), then 'tickle' the reamer.

 

[TheePres]

Most reaming feeds and speeds i have seen on manufacturers charts call for 25-30 SFM on mild steel.

[Bruce Caulley]

2/3 drilling RPM and 2-3 times drilling feed.

 

It is a reamer not a boring bar.

 

Bruce

[Psychomill]

quote:

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Most reaming feeds and speeds i have seen on manufacturers charts call for 25-30 SFM on mild steel.

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I've seen that too...

 

but I usually try to get the part to cycle in under 1 shift....

 

[TheePres]

 

OK good point!!

[jeff]

611 rpm 5.3 IPM feed for a .3125 hss reamer in 1018 mild steel.

Works perfect everytime.

[jbel]

quote:

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The rule of thumb I was taught in my apprenticeship days was half the speed(rpm) and twice the feed(ipm).

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[john_070]

300 and three works for me why rush it.