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Thread: reamers
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25th October 2011, 08:24 PM #1future machinist
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reamers
what do you guys think about reamers as my local tool shop has a set of reamers they got from china for $150 this consists of sizes 6-20 mm but the tolerances are a mix of h7 and h8 whatever that means.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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25th October 2011, 08:40 PM #2GOLD MEMBER
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What type of Reamers are they,Hand,Morse Taper,Chucking ,Adjustable,parallel or spiral flutes.
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25th October 2011, 08:43 PM #3future machinist
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they are machine reamers i think they are straight fluted.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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26th October 2011, 08:15 PM #4
If they are sharp and the grinding is good then $150 sounds cheap for a set, If they perform properly they should make drilling and boring to common sizes easier and quicker
Not sure what you mean by tolerances H7 H8 could refer to the steel and it doesnt make sense to mix tools made to different toleranceshappy turning
Patrick
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26th October 2011, 08:33 PM #5GOLD MEMBER
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i thought spiral flute reamer's were machine reamers and straight flute reamers are for hand use.
what sort of jobs would u be using them on?
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26th October 2011, 08:56 PM #6future machinist
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i would be using them to ream pin hole and model engine cylinders so mostly aluminium and brass but also quite a bit of steel.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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26th October 2011, 09:58 PM #7
Hi guys the H7 H8 and so on are the tolerance to the size. As for the reamers the tapper reamers are hand reamers and the straight ones are machine most of the time.
Davidgiveitagoturning @hotmail.com
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26th October 2011, 10:09 PM #8GOLD MEMBER
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27th October 2011, 07:48 PM #9
So what tolerances are the h7 and h8 tools expected to hold under proper use?
happy turning
Patrick
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27th October 2011, 07:57 PM #10GOLD MEMBER
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It depends on the hole size, but for example using a 6mm to 10mm hole. H8= +.022mm -0.0mm. H7=+0.015mm -0.0mm
Assuming of course I havent gone crossed reading the tables
Stuart
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27th October 2011, 08:14 PM #11
Hi Patrick,
As Stuart said... if you have a copy of Machinery's Handbook, or (better) The black book, look it up under "Limits and Fits", H8 is classed as close running fit, and H7 is classed as sliding fit.
Regards
Ray
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27th October 2011, 10:09 PM #12
My black books at work but I know the table you are referring to,...... Personally I would not get them but maybe go for a good adjustable set........ still $150 sounds like a good price if those fits are what you are after
happy turning
Patrick
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27th October 2011, 10:42 PM #13future machinist
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well i am not sure as i found a second hand adjustable reamer set made in Melbourne with sizes up to 1 1/16 for $180
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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