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Broken Tap

David Davies All Messages By This Member #112447 David Best introduced me to this channel on youtube and I'm working through his videos in preparation to start playing with a new mill and lathe.? Found this video and wanted to post here as an extension of the discussion on tapping. Dave toggle quoted message Show quoted text On Mon, Dec 14, 2020 at 1:45 PM Cliff Rohrabacher, Esq. <rohrabacher@...> wrote: one more thing When hand tapping? using a cutting tap or die ( as opposed to a forming tap or die) Drive the tap in? about half a turn ( or so)? and then back it out? a half turn (or so).? You will figure this out? the forst time you do it.? What is happening is? you need to "Break the Chip" that was forming as the tap or die cut into the material.? Backing it off like that? will? do a few things (1)? Replenish the lube at the cutting? edges, (2) snap that off and make things progress easier, (3)? it makes it way more possible? to extract a broken tap and? (4) way less likely? that you will snap a tap.? On 12/13/20 7:55 PM, imranindiana via wrote: is anyone familiar with accusize industrial tools? it is a canadian co out of toronto. i recently purchased two tap & drill sets metric and SAE. i went with them because they offered HSS at reasonable price. i used the 1/2-13 tap first time today and it broke mid way in 1/2” CR1018 steel bar. yes, i did drill 27/64” hole with the drill that came with the tap. just curious, folks with metal knowhow, can you tell if this break shows a manufacturing defect? i am sure they will send me a replacement tap but i am just wondering if i should return the set or both sets because i am not sure of the quality any more. Imran -- Dave & Marie Davies 318-219-7868
Chris Perren All Messages By This Member #112448 开云体育 Yes – Same here although it’s in my back yard in Austin, TX.? ? Regards, ? Chris Perren ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of David Davies Sent: Saturday, January 2, 2021 12:49 PM To: [email protected] Subject: Re: [FOG] Broken Tap ? David Best introduced me to this channel on youtube and I'm working through his videos in preparation to start playing with a new mill and lathe.? Found this video and wanted to post here as an extension of the discussion on tapping. Dave ? ? ? ? On Mon, Dec 14, 2020 at 1:45 PM Cliff Rohrabacher, Esq. <rohrabacher@...> wrote: one more thing When hand tapping? using a cutting tap or die ( as opposed to a forming tap or die) Drive the tap in? about half a turn ( or so)? and then back it out? a half turn (or so).? You will figure this out? the forst time you do it.? What is happening is? you need to "Break the Chip" that was forming as the tap or die cut into the material.? Backing it off like that? will? do a few things (1)? Replenish the lube at the cutting? edges, (2) snap that off and make things progress easier, (3)? it makes it way more possible? to extract a broken tap and? (4) way less likely? that you will snap a tap.? ? On 12/13/20 7:55 PM, imranindiana via wrote: is anyone familiar with accusize industrial tools? it is a canadian co out of toronto. i recently purchased two tap & drill sets metric and SAE. i went with them because they offered HSS at reasonable price. ? ? i used the 1/2-13 tap first time today and it broke mid way in 1/2” CR1018 steel bar. yes, i did drill 27/64” hole with the drill that came with the tap. just curious, folks with metal knowhow, can you tell if this break shows a manufacturing defect? ? ? i am sure they will send me a replacement tap but i am just wondering if i should return the set or both sets because i am not sure of the quality any more. ? Imran ? -- Dave & Marie Davies 318-219-7868
David P. Best All Messages By This Member #112451 开云体育 This is the tap and die holder I made for my lathe - including drawings if you want to make your own. ? Adjust a bit more sophisticated than Joe Pie’s. ? David Best - via mobile phone? toggle quoted message Show quoted text On Jan 2, 2021, at 10:49 AM, David Davies <myfinishingtouch@...> wrote: ? David Best introduced me to this channel on youtube and I'm working through his videos in preparation to start playing with a new mill and lathe.? Found this video and wanted to post here as an extension of the discussion on tapping. Dave On Mon, Dec 14, 2020 at 1:45 PM Cliff Rohrabacher, Esq. <rohrabacher@...> wrote: one more thing When hand tapping? using a cutting tap or die ( as opposed to a forming tap or die) Drive the tap in? about half a turn ( or so)? and then back it out? a half turn (or so).? You will figure this out? the forst time you do it.? What is happening is? you need to "Break the Chip" that was forming as the tap or die cut into the material.? Backing it off like that? will? do a few things (1)? Replenish the lube at the cutting? edges, (2) snap that off and make things progress easier, (3)? it makes it way more possible? to extract a broken tap and? (4) way less likely? that you will snap a tap.? On 12/13/20 7:55 PM, imranindiana via wrote: is anyone familiar with accusize industrial tools? it is a canadian co out of toronto. i recently purchased two tap & drill sets metric and SAE. i went with them because they offered HSS at reasonable price. i used the 1/2-13 tap first time today and it broke mid way in 1/2” CR1018 steel bar. yes, i did drill 27/64” hole with the drill that came with the tap. just curious, folks with metal knowhow, can you tell if this break shows a manufacturing defect? <image0.jpeg> <image1.jpeg> <image2.jpeg> i am sure they will send me a replacement tap but i am just wondering if i should return the set or both sets because i am not sure of the quality any more. Imran -- Dave & Marie Davies 318-219-7868

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