Modernization of a Chinese drilling machine, bad experience 

Panie majster, wszystkie wyniki są jak najbardziej spodziewane. Z cienką kolumną ciągnąc za "wajchę" rura ugina się na całej długości + do tego stolik (a stolik jest dość wysoko, więc mierzalne ugięcie jest "małe"). Po zalaniu kolumny jest ona bardzo sztywna, więc całą siłę ugięcia przejmuje najsłabsze ogniwo (stolik). Przy takim pomiarze trzeba było mierzyć ugięcie między głowicą, a podstawą maszyny i wtedy ugięcie z pewnością byłoby mniejsze po zalaniu kolumny (i to znacznie). W tych małych wiertarkach to właśnie stolik jest najbardziej wiotki i to właśnie na jego modyfikacji trzeba się skupić. :)

It seems obvious to me that the first thing to reforge is the work bench where the base of the drill rests.

I'm not sure that you did more to decease post bending than increase the weight of the machine. The dial still moves a quarter turn Thanks for the video

I think I would look around for a machinery auction and try to buy a 75 year old drill press made in England or similar.

Mmm, I think you improved definitely the column in reducing vibrations, but I'm pretty sure you should also give a look at the table as it's bending many times.. Some angular support should be appreciated.. =)

Примите мои соболезнования коллега! Сам прошёл этот кривой путь, заливал колонну смолой + арматура. Не помогло. Единственный более-менее реальный выход - замена фланца на более высокий и широкий и имплантация металла под базу. Остальное не поможет.

usually bending happens within the table against the column when applying (down) force. in my experience the only way to make these cheap drill presses drill properly is to put something under the table as a support.

I would replace those top grub screws, tapped holes and screws locate better than a grub screw on a diameter. Or possibly add dowel pins to add rigidity?

La brida que sujeta la columna al pie, está rellena con papel o plástico, ahí hay un defecto de rigidez

Замечания: 1.Это не песок. На вид это земля. Лучше прогуляться и набрать речного. Благо нужно не много. 2.Водоцементное соотношение делали на глаз. 3.Пластификатор не использовали. 4.Вибрирование не сделали. 5.Был ли выдержан полный срок (27 дней) - не известно. У людей отношение к бетону как у детей к каше-малаше в песочнице.

Тут притяжка к трубе головы станка идет двумя винтиками, а не сжатием ободка вокруг трубы. Причем место прижатия винтов совсем не в том направлении работает чтобы удержать голову от качния вперëд-назад, а только вбока. Может в этом всë дело? Просто первонаяальная нагрузка после сборки отклонила верхнюю часть назад по максимуму, а при первом измерении голова уже была нагрузками при сверлениях отклонена. Так что не правильный замер, имхо. Можно попытаться сзади пару болтов вкрутить чтобы уменьшить влияние люфта неплотного надевания на трубу верхней части.

1.Станки если и заливают бетоном,то полимерным.2 Эту шляпу как не заливай,толку не будет.3.Причины нежесткости не только в колонне.

Simple et efficace, Bravo, Bravo. Benny Rooman à Bruxelles.

Olá. Como você disse olhe para o outro lado. O problema de oscilação é a base onde você fixa a coluna. Aumente a rigidez da base e a coluna deixa de oscilar.

Пропорция 1 к 3 вполне достаточна, цемент это связывающий материал, большее его количество не означает крепче а может сделать все наоборот.

Very very very excellent I like it

La rigidez de ls maquin se podria haber solucionado mejorando la base no la columna..

absolutely take a look column vs head unit and then column vs vise base. Lot of play in head unit and vise base column clamps . Lot of play in the tilt system of the vise base also. Every surface must be straightened. Good luck

The column is thin, you definitely added some strength but I believe the flexing of the baseplate is the issue. Adding more steel to the underside would help greatly and not interfere with any other function.

Im heaving same problem and i came with conclusion that bench is a problem too,that is a part which is bending.

Thanks you brother infomation

Yo tengo un taladro similar marca silver línea y no tuve ningún problema de pandeo o movimiento, la clave es que la base donde asientas el taladro sea completamente rígida, en mi caso fué una viga I de acero de 8 x4 pulgadas.

Good job.

The tube is rigid enough - the base connection to the foot, and the very simple two grub screws in the receiver in the head will be the weak points, probably a bit of both but more up top. Increasing the mass of the drill stand is not a bad thing though, it will dampen vibrations and squealing considerably. The Chinese can build very well and to very high standards - it's just that isn't the stuff they export, and they also export 100% of what the factories produce for the foreign purchasers, including the rejects and badly finished or fitted machinery... Perhaps fitting the head assembly using heavy Loctite type locking compound to fix it in place and remove any possible play will help? Could be problematic getting it back apart though later...

Belle iniziative continua cosi ! 👍

Para que trabaje bien el concreto reforzado tienes que pre-tensar las varillas de construcción (poniéndole unos tornillos y estirarlos fuertemente dentro del tubo antes de vaciar el concreto) pero teniendo en cuenta de no flexar el tubo. Tener presente el tiempo de fraguado y humedad necesaria, además si lo vibras un poco quedaría más compacto.

Y ahora que hacer si se mueve mas por ejemplo si pones un tubo de pared mas gruesa?

Interesting result. Is it possible to get the head tighter on the column maybe that's where the movement is? I had some ribbed rubber mat from bench-top and glued it onto the flat surfaces, even more dramatic than window seal

Excelente y muy interesante... Quisiera ver qué se puede hacer con la correa

La idea suyo muy bueno , esos taladros en realidad son unos juguetes , los chinos fabrican , pero tienen criterio , pero le ponen un logo para uso industrial , primero no tiene estabilidad , el motor se recalienta , las fajas son para juguetes . Yo los utilecè solo para inspirarme , colocas un tubo pared 6 mm , motor 2 HP , poleas para faja tipo A , tienes un taladro 8 horas perforando , saludos desde SICUANI Cusco Perú 🇵🇪

У круглой трубы очень большая жосткость! Вся проблема в неправильном креплении головы и жосткости столика! Я бы сказал это очень удачный эксперимент!

Filling the column with cement does not affect the performance because the side load is very small (perhaps only 15-20 kg). The rigidity can be improved by using a better foundation and mounting.

And next put a scrissor jack under the table to support it. Then it will be quite stabile.

I would support the Table and shim the top of the pillar where the drill attaches..

the concrete will reduce chatter - but it's not doing anything about that flex - that's in the table. particularly the single center-pivot bolt where the table can be tilted. The base is also a big source of flex.

I bought a Chinese column drill and aside from being an imprecise construction machine, the first problem that came up was the table that didn't keep a square with the column, therefore, with the spindle. I then placed an adjustable support that, supported on the base, keeps the table horizontal. Afterwards there was no way to stop the straps from slipping. I removed the pulleys and replaced it with sprockets and chain. I didn't worry about varying the speed, but I left around 200 RPM which is good for bigger and smaller drills. It got a little noisier, but it certainly doesn't skate anymore. I use it to drill 1020 and 1045 steel mainly between 10.5 and 25.0 mm. I even made a system with an aquarium pump and so I have refrigeration. For smaller holes I use a bench drill similar to the one shown in the video.🇧🇷

to nie wina sztywności kolumny tylko słaba sztywność stolika .

Nice attempt. It is next to impossible to make a silk purse out of a pigs ear. It will never be anything other than a Chinese drill press.

Please show your stepcraft and the mods you made

У китайской сверлилки отгибается столик. Тут уж цемента хоть в трусы насыпай - не поможет так и эдак. Круглую трубу с 3мм стенкой сложнее будет согнуть.

Good solution , I filled mine with a tooling resin and welded a plate to the machine base and cast that solid as well , not much improvement in accuracy but took the resonance out of the drill so could drill 14.00mm holes straight through 50 mm cast iron with no vibration ….. as another comment said about sows ear and silk purse !! ( my drill came out of a skip at work !) it will always be a cheap drill

pobre soldadora bajo el taladro 🥺

A mali estremi, estremi rimedi. Bel video!

Em algo descartável não existe tentar recuperar o que já foi concebido com economia ao máximo , o bom seria recuperar o dinheiro e comprar um produto mais caro e que de resposta aceitável a sua proposta

The concrete does not contact really the steal. So no changing in bending is to expect. The second problem ist the table. I guess, there is much more of the bending. Try something with the table. And changing the tube to another one with more the 2mm will bring something.

It would have been better to add a tight fit column inside the old one.

Hello, I have exactlly the same drilling machine and I think that the bending comes from the weakness of the table's fixture. Unfortunately the only solution I found is to use a little hydraulic jack under the table. I had the same idea as You, filling the column with cement, but it was in order to reduce vibrations by increasing the mass of the machine. I will try the foam loint. Thanks for sharing your experience.

Tuyệt vời!

E improbabile che il problema venga dalla colonna quanto invece dal pianetto.... In più la misurazione che fai con il comparatore ti appoggiandolo al pianetto ti riporta anche tutto il suo errore oltre a quello eventuale della colonna

У меня китаец поменьше Внутренний диаметр колонны 52 Я взял советскую 57 стенка 4 трубу чуть длиннее разрезал вдоль 2 реза выбросил где то 8 10 мм и вогнал ее вовнутрь стойки прессом также поменял нижнюю плиту сделал из 300 швеллера с ребрами жесткости и поставил помощней нижний фланец(сделал из водопроводного) Жесткость увеличилась где то в 2 раза не идеал конечно но стало получше Успехов Вам

Agrego a mi anterior comentario, la columna no tiene flexión, es donde asientas el taladro.

This machine imported from China and sold at such a reasonable price needs to take more credit than you give it!!..Bending moment of the post...what do you expect from a 100UKP machine.I have machines working in my shop costing 1000's all to drill a little hole, so a cheapeo from China does the job, reduces overhead costs and needs praise that the UK could never ever produce this bit of kit at a price that simply does the job.. Its a tool to do the job and it does it well, If you need to use a dial gauge then but a Simmons at 23,000UKP.

Claramente se ve un espacio en la base de la brida que intentaron rellenar con un forro de plastico, min.3.25~3.30 ademas creo primero se debe procurar estabilizar la base haciendola mas rigida

Good afternoon where you bought the site as you did I'm from Brazil send it in Portuguese thank you.

for what is that masking tape round the pipe

Dobry sposób na chińskie badziewie !!!!

Exelente.

Genius

jednak bym zmienił tą rurę na grubościenna , wymiana silnika na mocniejszy 3 fazowy prawo lewo , no i inna sztywniejsza stopę

I wonder, is it the table kinda flexing and not the tube? The onky thing holding the table is a loosely clamped gear and a set screw. Just a thought.

Big work for not much, changing the tube by another of the same diameter but in 3/4 or even 5mm would have been much faster, cheaper and above all more judicious and efficient.

Para la base utilicé 2 pedazos de rieles cepillados , nos se mueve para nada

The best....not sound track..

Good effort. Flex is from a number of areas. Table fit to column plus motor head fit to column . Plus it is a inexpensive little machine. Much better than a hand drill but not a mill. Great for drilling many many holes.

You need tight fit between the column and the motor unit. Also between te colunm and the work top system.

o sea que ponerle cemento fue una perdida de tiempo?

Rebar is only useful when tensioning cement, otherwise, under compression, just cement is better.

i thought about replacing the pipe with a stronger one?

Cześć kolego. Mam podobną wiertarkę już kilkanaście lat Powermat 450W. Jest to dobra maszyna ale też mało sztywna. Problemem w tych sprzętach jest sztywność ruchomego stołu. Wspornik tego stołu jest zbyt delikatny i od nacisku wiertła ugina się. Ja przy większym wierceniu pod blat podkładam podnośnik śrubowy, który nie pozwala na ugięcie się stołu. :)

interesting idea i think the cement will slip down as it shrink's

You have to change the pipe and the basic flange make it bigger and it will be ok.

Основание у этих станков хилое, а не стойка. Хотя....стойка тоже, та еще фольга.

Bastava non acquistare il trapano cinese,potevi optare per una macchina usata ma di qualità,con basamento in ghisa,corpo macchina fuso e colonna spessa. Non una macchina utensile fatta di latta. Ciao

Not the pipe is the problem - the stiffening at the groundplate is the problem

wow, I couldn't believe how thin that tubing is. That's ridiculous.

Возьми буровую трубу, будет счастье, правда на токарном надо обточить будет, зато жесткости будет много. И ещё вместо шестигранников, которые крепят верхнюю бабку к трубе сделать хомут зажимной

Nếu bạn đổ luôn bàn đế của trụ thì sẽ êm hơn chúc bạn thành công

There’s play in the hole system is at fault I have the same drill press I’m toying with the idea of welding all the base parts together but I would get a much thicker pole first then shim the top of the pole to take out as much of the slack ( there is a lot of play ) then refit the head

It would have been easier to replace the column with a solid bar.

You probably add some stiffness in the assembly but your test method is as bad as the way you make concrete:-)

The concrete should have been vibrated at least, to compact it! However, its more likely that the fit from the drill head to the pillar has some freedom. Therefore, I would suggest that you assemble the components using 'bearing fit' or a thick superglue, to eliminate any possible movement between the various components. .

No está demás ponerle enfierradura dentro del tubo de fierro?? 👽

J’ai une perceuse chinoise aussi ( le modèle en dessous) en fait c'est pas la colonne qui tord c'est la table

A good test would be to put the mag base on the column and then probe the head and the table independently. It seems likely the fit between the post and the head is not rigid and would benefit from another circle of screws. Also, the large center screw that locks the tilt of the table needs to be tight and the two mating surfaces need to contact on their periphery. Placing a scissors jack between the base and the table will make a measurable difference.

Witam. Tak, patent bardzo dobry. Ja w swojej wiertarce zastosowałem rurę od siłownika i ścianka ma chyba 8 milimetrów grubości. 20 lat temu budowałem frezarkę i lałem beton w profile kwadratowe. Pozdrawiam.

Треба було замість водного розчину використовувати епоксидну смолу ......на мій погляд результат був би набагато краще. Та ще треба було б використовувати ущільнення вібрацією , перфоратором.....

Недостаточно жесткости нижней крепежной пощадки и фланца

Also bei diesen Tischgestell für die Bohrmaschine hätte ich auch meine bedenken, wackelt wie ein Lämmerschwanz!!!

Sorry, but any true Machinist knows that the real problem with cheal drill presses, is the spindle speed. These cheap machines are made for wood, plastic, and non ferrous metals AT BEST.

Я с китайцем 3 года воевал: в колонну шпильку забетонировал d 28, основание усилил металлом 10 мм, ну нет жёсткости и все. Отверстия все-равно криво получаются. Итог:- подвернулся станок советский СН15-Ш1 , состояние ужасное, но махнул китайца на этого динозавра. Восстанавливал 2 месяца, теперь не нарадуюсь, жесткость такая, что можно потихоньку фрезеровать. Но конечно, все зависит от поставленных задач.

Jakie marnotrawstwo materiału ;-), tak grubą rurę zastosować 8-D

Я заливал себе станок тоже бетоном только вместе с нижней основой а стол подпираю домкратом, теперь совсем не прогибается

No veo la ventaja de llevar el tubo de la columna con material y otra columna de hierro de construcción, lo mejor es cambiarlo por otro del mismo diámetro pero de una pared de al menos 3/16 de espesor y listo, además es una agujereadora para trabajos chicos y tiene suficiente capacidad cambiándole la columna .

Edit: in another comment I found one that solved with the prop method under the table, fifth I confirm that the principle of my idea is correct.. the read carefully my post :-)) the bending you get is mainly due to the flexibility of the fixing system of the mobile top to the column. You could take three or 4 sections of 3/4 - 1.5 inch diameter plumbing pipe with the relative couplings (in the brico centers they already sell them threaded from both ends) in order to create a prop that goes up from the foot of the drill. up to the lower part of the adjustable plate. At the head of this prop you put a threaded plate that supports a threaded bar of 12 mm or more that can reach exactly against the lower side of the adjustable plate. at this point, if everything is well inserted, the displacement should be reset

Собирал, разбирал, варил, мешал, заливал... Результат - "0"! Как прыгала башка на четверть шкалы, так и прыгает...

Не тратьте время зря,колонну можно выкинуть.Лучше новую толстостенную изготовить как у 2м112.

Haber haber....momento...!!!...veo muchos muchos opinan pero sin base tecnica....esos taladros chinos son muy muy malos solo para cosas muy ligeras y simples de uso...conoscooo del tema de sobra....y eso del concreto nones asi porque el concreto es flexible al igual que una casa o una puente de concreto....solo que en medidas menores casi no vistas a ojo humano

Арматура в этом случае жесткости совсем не прибавит, в бетонных изделиях арматура работает на растяжение, в данном случае пока возникнет растяжение, колонна будет ощутимо согнута.

Ile zapłaciłeś za ta wiertarkę ? Dobre chińczyki zaczynają się od 4000 PLN w górę .

Hàng giá rẻ của Trung Quốc chỉ để phục vụ các công việc không đòi hỏi độ chính xác cao, nếu muốn dùng cho mục đích nhu càu cao thì bạn hãy mua các sản phẩm có chất lương cao khác