Breaking Reamers

[Tyler2016]

Hi, I am reaming a .104 through hole 1.1 inches deep. Material is 15-5 H1050. Reamer is 4 flute HSS. Currently running at 1000 rpm with feed of .004 IPR. Drilling hole at .0995. Its breaking after about 30-40 parts.

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[mactec54]

Hi, I am reaming a .104 through hole 1.1 inches deep. Material is 15-5 H1050. Reamer is 4 flute HSS. Currently running at 1000 rpm with feed of .004 IPR. Drilling hole at .0995. Its breaking after about 30-40 parts.

You are taking to much out .009" want to be no more than .005" or .006" max and 800 RPM feed In Feed Out but 30 to 40 parts in that material is doing quite well as the reamer would get dull quite quick, carbide would last better, what cutting fluid are you using

[the_gentlegiant]

Try a #38 pre-drill instead. You might also try taking 10% off your speed and 20% off your feed.

If you have a lot of these yes go with carbide. I've had good luck with MAFord TrueSize reamers.

[Tyler2016]

You are taking to much out .009" want to be no more than .005" or .006" max and 800 RPM feed In Feed Out but 30 to 40 parts in that material is doing quite well as the reamer would get dull quite quick, carbide would last better, what cutting fluid are you using

Thank you I will try that. I'm using blaser coolant

[Tyler2016]

Try a #38 pre-drill instead. You might also try taking 10% off your speed and 20% off your feed.

If you have a lot of these yes go with carbide. I've had good luck with MAFord TrueSize reamers.

Thank you. What would you recommend for speed and feed with the carbide reamer?

[mactec54]

Thank you. What would you recommend for speed and feed with the carbide reamer?

The same speed and feed as I posted

[the_gentlegiant]

65-100 SFM
0.0015-0.0032 ipr

MAFORD Specs

I'd start on the lower side of sfm and mid range of ipr w/coolant

Note that is a deep hole for a reamer this size.

[deadlykitten]

hy tyler i will do a bit of math ... reaming o2.6416 x 27.94, at 1000 rpm * 0.1016mm/rot; drilling at 2.5273

please :
... share a photo with the center drill toolholder, drill(s) toolholder and the reamer toolholder, and share the alignment procedure ( i need to know these, in order to understand the stability of your setup )
... do you have acces to a load chart ? ( this helps monitoring the load, looking for sudden peeks, and adjusting the specs; this helps identifing problems with chips evacuations, and also other specifics )
... share a photo with the part & fixture; mill / lathe, through hole ?

just a wild guess :
... you may need to increase the cilindricity before reaming, by replacing the drill with a more stable tool, or by using 1-2 intermediate reamers, maybe shorter then longer ?
... you may need to decrease the tooling costs, by crafting your own reamers, custom, specific to your application

i don't know what to say, i don't know your setup, there are things to discussssssss / kindly

ps : just like mactec said, your current score, of 30-40 parts / reamer, is prety ok ... also, there may be room for improvement; i don't recomand you an integral carbide reamer, since hss is more flexible; i would try a hss soft tool, superficialy hardened only among the cutting edges + other tricks

ps2 : hole tolerance and go-gauge length ?

[mactec54]

65-100 SFM
0.0015-0.0032 ipr

MAFORD Specs

I'd start on the lower side of sfm and mid range of ipr w/coolant

Note that is a deep hole for a reamer this size.

Have you ever used the material he is using

[the_gentlegiant]

No was just repeating what I read in the manufacturer's catalog and broadly comparing to my feeds and speeds calculator using a PH Stainless around RC35 or 330 Brinell.

Those numbers were for a 0.104" carbide reamer.

[machinehop5]

15-5? drill to size

[mactec54]

No was just repeating what I read in the manufacturer's catalog and broadly comparing to my feeds and speeds calculator using a PH Stainless around RC35 or 330 Brinell.

Those numbers were for a 0.104" carbide reamer.

You must remember the numbers a manufacture quotes are just a guide and most don't work that well at all so you have to work with the different materials to know what will work